Datamined changes from current PBE release. Be aware that these changes are tentative and they might be changed or even reverted prior to the live patch.
Due to the nature of how the datamining works it may also includes some of the changes that are already added to the live version in the most recent patch.
Potentially missing changes:
- Mirage variations
- Zoe abilities
- Nomsy & Jade Statues

Vladimir
Vladimir deals 250/300/350

magic damage to the target and heals for 200/250/300

Health. Vladimir deals 250/300/350

magic damage to the target and heals for 270/300/330

Health. 
Ezreal
Ezreal fires an energy bolt towards his target. The first enemy hit takes 150/225/300

magic damage and grants Ezreal 10%

bonus Attack Speed, stacking up to 5 times. Ezreal fires an energy bolt towards his target. The first enemy hit takes 155/215/285

magic damage and grants Ezreal 10%

bonus Attack Speed, stacking up to 5 times. 
Skarner
Skarner shields himself for 275/325/375

for 8 seconds, and gains 160/180/200% Attack Speed while it holds. Skarner shields himself for 300/360/420

for 8 seconds, and gains 160/180/200% Attack Speed while it holds. 
Tahm Kench
Tahm Kench shields himself for 250/300/350

+ 10% maximum Health for 6 seconds. The next 3 enemy attacks he receives during this duration deal 75/100/125

magic damage to the attacker. Tahm Kench shields himself for 240/250/275

+ 10% maximum Health for 6 seconds. The next 3 enemy attacks he receives during this duration deal 75/100/125

magic damage to the attacker. 
Nami

Lillia
Lillia strikes a small area around her target's current location, dealing 175/250/350

magic damage spread amongst all enemies hit and 175/250/350

bonus magic damage to the enemy at the center of the blast. Lillia strikes a small area around her target's current location, dealing 215/275/350

magic damage spread amongst all enemies hit and 150/225/350

bonus magic damage to the enemy at the center of the blast. 
Qiyana

Diana
Diana shields herself against 300/350/400

damage over 6 seconds and summons 6/7/8 orbs to orbit around her. These orbs explode for 80/90/100

magic damage when they hit an enemy, refreshing her Shield when the final one explodes. Diana shields herself against 300/350/400

damage over 6 seconds and summons 5/6/7 orbs to orbit around her. These orbs explode for 80/90/100

magic damage when they hit an enemy, refreshing her Shield when the final one explodes. 
Swain
Swain transforms into Dragon Form, replacing his attacks with fireballs that deal 75/115/175

magic damage and replacing his Ability with Greater Fireball.Greater Fireball: Swain's next fireball deals 100% more damage and explodes in an area around his target. Swain transforms into Dragon Form, replacing his attacks with fireballs that deal 65/110/165

magic damage and replacing his Ability with Greater Fireball.Greater Fireball: Swain's next fireball deals 100% more damage and explodes in an area around his target. 
Lee Sin
Lee Sin kicks his target, stunning them for 1.5 seconds and knocking them back. The target and all enemies they hit take 300/375/500

magic damage. Lee Sin kicks his target, stunning them for 1.5 seconds and knocking them back. The target and all enemies they hit take 280/360/480

magic damage. 
Volibear
Volibear rages, gaining 375/650/1200 bonus Health. For the rest of combat, every 3rd attack deals 160/175/190

magic bonus magic damage to the target, and 160/175/190

magic damage to up to 3/4/5 additional enemies. Volibear rages, gaining 375/650/1200 bonus Health. For the rest of combat, every 3rd attack deals 110/155/215

magic bonus magic damage to the target, and 110/155/215

magic damage to up to 4 additional enemies. 
Sylas
Sylas whirls his chains, dealing 100/150/200

magic damage to enemies hit and shielding himself for 300/350/400

for 6 seconds. If Sylas has already shielded himself, he hits in a larger area and applies Mana-Reave to enemies hit, increasing the cost of their next ability by 35%. Sylas whirls his chains, dealing 110/170/240

magic damage to enemies hit and shielding himself for 365/415/475

for 6 seconds. If Sylas has already shielded himself, he hits in a larger area and applies Mana-Reave to enemies hit, increasing the cost of their next ability by 35%. 
Ornn
Ornn summons an elemental that charges towards Ornn through the farthest enemy, dealing 150/250/1000

magic damage to enemies hit and slowing their Attack Speed by 50% for 3 seconds. When the elemental reaches Ornn he redirects it towards another distant enemy, dealing 150/250/1000

magic damage to enemies hit and stunning them for 1.5/2/8 seconds. Ornn summons an elemental that charges towards Ornn through the farthest enemy, dealing 150/250/1000

magic damage to enemies hit and slowing their Attack Speed by 50% for 2 seconds. When the elemental reaches Ornn he redirects it towards another distant enemy, dealing 150/250/1000

magic damage to enemies hit and stunning them for 1.3/1.8/8 seconds. 
Hecarim

Neeko
Each Combat: Neeko disguises herself as the nearest allied champion, adding their bonus Attack Damage and Attack Speed to her own and copying all other stats except Health. She then gains a shield for 275/400/1200

plus 10/20/50% of her ally's Health.When the shield breaks, she transforms into Neeko Form, reverts back to her own stats, and casts Pop Blossom, dealing 300/425/1500

magic damage to nearby enemies and stunning them for 1.5 seconds. Neeko then casts Pop Blossom each time she reaches maximum mana. Each Combat: Neeko disguises herself as the nearest allied champion, adding their bonus Attack Damage and Attack Speed to her own and copying all other stats except Health. She then gains a shield for 275/400/2000

plus 10/20/50% of her ally's Health.When the shield breaks, she transforms into Neeko Form, reverts back to her own stats, and casts Pop Blossom, dealing 300/425/1500

magic damage to nearby enemies and stunning them for 1.5 seconds. Neeko then casts Pop Blossom each time she reaches maximum mana. 
Corki

Xayah
For 4 seconds, whenever Xayah attacks she fires a feather behind her target and 2/2/4 nearby enemies.At the end of this duration Xayah recalls her feathers, dealing 33/52/107

physical damage (25% Attack Damage
+ 15/20/50

) per feather to enemies struck. For 4 seconds, whenever Xayah attacks she fires a feather behind her target and 2/2/4 nearby enemies.At the end of this duration Xayah recalls her feathers, dealing 26/45/85

physical damage (20% Attack Damage
+ 12/20/40

) per feather to enemies struck. 
Sy'fen
Sy'fen charges toward the farthest enemy within 2 hexes, dealing 225/423/1620

physical damage (225/235/500% of Attack Damage
) and knocking up enemies he passes through.After charging, Sy'fen bites an enemy, dealing 450/900/8100

physical damage (450/500/2500% Attack Damage
) and ignoring 50

% of the target's Armor. Sy'fen charges toward the farthest enemy within 2 hexes, dealing 248/465/1782

physical damage (225/235/500% of Attack Damage
) and knocking up enemies he passes through.After charging, Sy'fen bites an enemy, dealing 550/1040/8910

physical damage (500/525/2500% Attack Damage
) and ignoring 50

% of the target's Armor. 
Idas
Idas hardens her scales for 2 seconds, reducing incoming damage by 50/75/300. She then roars, healing herself for 450/550/2500

Health and shielding other allies for 200/300/2000

for 5 seconds. The shield grants 40% Attack Speed while it holds. Idas hardens her scales for 2 seconds, reducing incoming damage by 35/50/300. She then roars, healing herself for 450/550/2500

Health and shielding other allies for 180/275/2000

for 5 seconds. The shield grants 30% Attack Speed while it holds. 
Daeja
Passive: Daeja's attacks launch three barrages that each deal 30/45/200

bonus magic damage and reduce the target's Magic Resist by 5.Active: Daeja sends a wind blast toward the largest group of enemies, dealing 225/350/1500

magic damage. Passive: Daeja's attacks launch three barrages that each deal 25/40/150

bonus magic damage and reduce the target's Magic Resist by 5.Active: Daeja sends a wind blast toward the largest group of enemies, dealing 250/375/1800

magic damage. 
Sona
Sona plays her ultimate chord toward the farthest enemy, dealing 190/275/1000

magic damage to enemies and stunning them for 1/1/4 seconds. Sona plays her ultimate chord toward the farthest enemy, dealing 200/300/1000

magic damage to enemies and stunning them for 1/1/4 seconds. 
Shyvana
Shyvana transforms into Dragon Form for the rest of combat, replacing her ability with Flame Breath. She then becomes untargetable before dive-bombing the largest group of enemies, dealing 100/175/500

magic damage and stunning them for 1.5 seconds. After landing, Shyvana casts Flame Breath again immediately.Flame Breath: Shyvana breathes fire in a cone, dealing up to 45/60/300

% of the enemy's maximum Health as magic damage. While breathing fire, Shyvana is always enraged. Shyvana transforms into Dragon Form for the rest of combat, replacing her ability with Flame Breath. She then becomes untargetable before dive-bombing the largest group of enemies, dealing 100/175/500

magic damage and stunning them for 1.5 seconds. After landing, Shyvana casts Flame Breath again immediately.Flame Breath: Shyvana breathes fire in a cone, dealing up to 50/66/500

% of the enemy's maximum Health as magic damage. While breathing fire, Shyvana is always enraged. 
Soraka
Passive: While any ally is below 50% Health, Soraka gains an additional 15 mana per attack. Active: Soraka calls down a shower of stars over the next 2 seconds. Allies are healed for 100/150/1000

each time a star hits them. Passive: While any ally is below 50% Health, Soraka gains an additional 15 mana per attack. Active: Soraka calls down a shower of stars over the next 2 seconds. Allies are healed for 120/180/1000

each time a star hits them. 
Zoe

Yasuo

Bard
Bard sends magical energy toward the largest group of enemies, stunning them for 1.5/2/15 seconds and causing them to take 15%/20%/9999%

increased damage while stunned. If he hits at least 1 enemy, Bard dances in celebration. Bard sends magical energy toward the largest group of enemies, stunning them for 1.3/2/15 seconds and causing them to take 15%/20%/9999%

increased damage while stunned. If he hits at least 1 enemy, Bard dances in celebration. 
Pyke

Aurelion Sol
Aurelion Sol summons an unstable black hole underneath a random enemy. After 2 seconds it implodes, dealing 160/240/2500

magic damage to all enemies in the area and reducing their Attack Damage by 40% for 3 seconds. Each cast the area increases by 50% and the damage increases by 160/240/2500

. Aurelion Sol summons an unstable black hole underneath a random enemy. After 2 seconds it implodes, dealing 325/450/5000

magic damage to all enemies in the area and increasing their damage taken by 20% for 10 seconds.Black holes generated after 20 seconds of combat are larger and deal 50% more damage. 
Cannoneer
(2) 150% Attack Damage
(3) 200% Attack Damage
(4) 250% Attack Damage
(5) 300% Attack Damage
(2) 150% Attack Damage
(3) 210% Attack Damage
(4) 280% Attack Damage
(5) 350% Attack Damage

Assassin
(2) +15% Crit Chance and +15% Crit Damage
(4) +30% Crit Chance and +30% Crit Damage
(6) +45% Crit Chance and +50% Crit Damage
(2) +15% Crit Chance and +10% Crit Damage
(4) +30% Crit Chance and +20% Crit Damage
(6) +45% Crit Chance and +40% Crit Damage

Ragewing
(3) +50% Attack Speed and +30% Omnivamp (healing for a percentage of damage dealt)
(6) +125% Attack Speed and +50% Omnivamp
(9) +225% Attack Speed and +70% Omnivamp
(3) +50% Attack Speed and +25% Omnivamp (healing for a percentage of damage dealt)
(6) +135% Attack Speed and +50% Omnivamp
(9) +250% Attack Speed and +75% Omnivamp

Guild
(1) 100% Guild bonus
(2) 120% Guild bonus
(3) 140% Guild bonus
(4) 160% Guild bonus
(5) 180% Guild bonus
(6) 200% Guild bonus
(1) 100% Guild bonus
(2) 120% Guild bonus
(3) 140% Guild bonus
(4) 160% Guild bonus
(5) 180% Guild bonus
(6) 200% Guild bonus
(7) 250% Guild bonus

Evoker
(2) 3 Mana
(4) 6 Mana
(6) 10 Mana
(2) 3 Mana
(4) 7 Mana
(6) 12 Mana

Dragonmancer
Use the Dragonmancer Blessing item to choose a Hero. The Hero gains massively increased Health and Ability Power, which increases by 10% per star level of your Dragonmancers.(3) +450 Health, +20% Ability Power
(6) +1350 Health, +60% Ability Power
(9) +2250 Health, +100% Ability Power
Use the Dragonmancer Blessing item to choose a Hero. The Hero gains massively increased Health and Ability Power, which increases by 20% per star level of your Dragonmancers.(3) +300 Health, +15 Ability Power
(6) +750 Health, +35 Ability Power
(9) +1400 Health, +60 Ability Power

Scalescorn
If you don't have a Dragon on your team, Scalescorn champions deal bonus magic damage. They also take 20% reduced damage from enemies with more than 2200 Health.(2) 20% magic damage
(4) 50% magic damage
(6) 80% magic damage
Scalescorns take 20% reduced damage from enemies with more than 2200 Health. If you don't have a Dragon on your team, they also deal a percent of their damage as additional magic damage.(2) 15% magic damage
(4) 50% magic damage
(6) 100% magic damage

Whispers
(2) +1 Attack Damage and Ability Power
(4) +2 Attack Damage and Ability Power
(6) +4 Attack Damage and Ability Power
(8) +6 Attack Damage and Ability Power
(2) +1 Attack Damage and Ability Power
(4) +3 Attack Damage and Ability Power
(6) +5 Attack Damage and Ability Power
(8) +8 Attack Damage and Ability Power

Revel
(2) 150 magic damage
(3) 175 magic damage
(4) 225 magic damage
(5) 275 magic damage
(2) 140 magic damage
(3) 170 magic damage
(4) 210 magic damage
(5) 300 magic damage

Trainer
Every round, each Trainer feeds 1 Snax per star level to Nomsy, adding Health and Ability Power. Nomsy's star level increases every 25 Snax! After combat, each Trainer feeds 1 Snax per star level to Nomsy, adding Health and Ability Power. Nomsy's star level increases every 25 Snax! 
Warrior
(2) +120% damage
(4) +200% damage
(6) +350% damage
(2) +120% damage
(4) +220% damage
(6) +420% damage

Astral
Every 5th Shop has increased odds to show Astral champions, and also grants an Astral orb.Your team gains bonus Ability Power. (3) 5 Ability Power
(6) 30 Ability Power; orb value increases
(9) 70 Ability Power; orbs may contain components
After you've fielded an Astral team, every 5th shop has increased odds to show Astral champions, and grants a bonus Astral Orb. The orb's value comes from the Astral Trait tier you last fielded.Your team gains bonus Ability Power. (3) 10 Ability Power
(6) 40 Ability Power; orb value increases
(9) 80 Ability Power; orbs may contain components

Blue Blessing
Grant
50 starting Mana. Gain
30 Mana after casting an Ability.Radiant Bonus:
30 Ability Power. Unique - only 1 per champion
After casting an Ability, set Mana to
30.Radiant Bonus:
30 Ability Power. Unique - only 1 per champion

Manazane
Once per combat: After casting a spell, restore
150 Mana over 4 seconds.Unique - only 1 per champion
Once per combat: After casting a spell, restore
200 Mana over 5 seconds.Unique - only 1 per champion

Mogul's Mail

Giant Slayer
Abilities and attacks deal 25% bonus damage. If the target has more than 2200 maximum Health, the bonus increases to 50%.
Abilities and attacks deal 20% bonus damage. If the target has more than 2200 maximum Health, the bonus increases to 45%.

Sunfire Cape
Grant
400 bonus Health (including components). Every 2 seconds, an enemy within 2 hexes is burned for 10% of their maximum Health as true damage over 10 seconds, and reducing healing by 50% for the duration.Unique - only 1 per champion
Grant
300 bonus Health (including components). Every 2 seconds, an enemy within 2 hexes is burned for 10% of their maximum Health as true damage over 10 seconds, and reducing healing by 50% for the duration.Unique - only 1 per champion

Blue Buff
Grant
50 starting Mana (including components). Gain
20 Mana after casting an Ability.Unique - only 1 per champion
Grant
50 starting Mana (including components). After casting an Ability, set Mana to
20.Unique - only 1 per champion
Gain 4 bonus experience points per round. You can no longer use gold to level up.
Gain 5 bonus experience points per round. You can no longer use gold to level up.
Your units without items equipped gain 60 Armor and Magic Resist.
Your units without items equipped gain 65 Armor and Magic Resist.
After casting their Ability, your units restore 20 Mana.
After casting their Ability, set the caster's Mana to
20. Your team counts as having 1 additional Shapeshifter. Gain a Hand of Justice and an Elise.
Your team counts as having 1 additional Shapeshifter. Gain a Sunfire Cape and an Elise.
Your champions permanently gain 1 Attack Damage every time they kill an enemy. Champions start with 5 bonus Attack Damage.
Your champions permanently gain 1 Attack Damage every time they kill an enemy. Champions start with 8 bonus Attack Damage.
Mirage champions take 90% less damage for the first 5 seconds of combat. Gain a Yone.
Mirage champions take 90% less damage for the first 6 seconds of combat. Gain a Yone.
If your bench is full at the end of a round, gain 3 experience points.
If your bench is full at the end of a round, gain 4 experience points.