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.
Datamining only captures numerical changes. It doesn't capture changes to mechanics and bugfixes that may also significantly affect balance.
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.
Updated: Apr 29 8PM

Mordekaiser
Gain 300/375/500 (
) Shield. Each second for the next 4 seconds, gain 75/90/105 (
) more Shield and deal 45/70/100 (
) magic damage to adjacent enemies. When this ability ends, consume the remaining Shield and heal for 40% of its value. Gain 300/375/500 (
) Shield. Each second for the next 64 seconds, gain 75/90/105 (
) more Shield and deal 45/70/100 (
) magic damage to adjacent enemies. When this ability ends, consume the remaining Shield and heal for 40% of its value. 
Zoe
Fire a paddle star at the current target, dealing 68/102/153 (
) magic damage to the first target hit and 34/51/77 (
) to others it passes through. When the missile reaches its destination, redirect it to a distant enemy, increasing its speed and repeating the damage. This redirect can occur 4 times. Fire a paddle star at the current target, dealing 68/102/153 (
) magic damage to the first target hit and 34/51/77 (
) to others it passes through. When the missile reaches its destination, redirect it to a distant enemy, increasing its speed and repeating the damage. This redirect can occur 64 times. 
Viktor
Channel a one-hex psionic storm that follows enemies for 4 seconds. Each second, it grows larger and deals 185/275/475 (
) magic damage to enemies within, reduced by 60% per hex from the epicenter. Channel a one-hex psionic storm that follows enemies for 54 seconds. Each second, it grows larger and deals 185/275/475 (
) magic damage to enemies within, reduced by 60% per hex from the epicenter. 
Aurelion Sol
Channel a deathbeam in a line towards the current target for 3 seconds. It deals 185/280/2000 (
) magic damage per second, reduced by 60% per enemy it passes through. Deathbeam ignores 30% of the enemy's Magic Resist. Channel a deathbeam in a line towards the current target for 43 seconds. It deals 185/280/2000 (
) magic damage per second, reduced by 60% per enemy it passes through. Deathbeam ignores 30% of the enemy's Magic Resist. 
Karma

Kindred
Passive: Attacks and Abilities mark the target. When an enemy reaches 3 marks, Wolf consumes the marks, dealing 125/190/1000 (
) physical damage. Active: Jump up to 1 hex away and fire arrows at the nearest 3/3/5 targets, each dealing 0.6/0.9/6 (
) physical damage. N.O.V.A. Strike: Gain 5% Damage Amp. Now and every 5 seconds after, add a mark to all enemies.
Arrow Damage: 0.9 (
) [60/90/600]
Passive: Attacks and Abilities mark the target. When an enemy reaches 3 marks, Wolf consumes the marks, dealing 125/190/1000 (
) physical damage. Active: Jump up to 1 hex away and fire arrows at the nearest 3/3/5 targets, each dealing 0.75/1.15/6 (
) physical damage. N.O.V.A. Strike: Gain 5% Damage Amp. Now and every 5 seconds after, add a mark to all enemies.
Arrow Damage: 1.15 (
) [75/115/600]

LeBlanc
Passive: Attacks deal 57/86/250 (
) magic damage instead.Active: Summon 5 clones that attack alongside for 5 attacks, dealing 25/25/150% damage. For their final attack, clones fire a bolt that deals 70/105/750 (
) magic damage.
Attack Damage: 86 (
) [57/86/250]
Passive: Attacks deal 62/93/250 (
) magic damage instead.Active: Summon 5 clones that attack alongside for 5 attacks, dealing 25/25/150% damage. For their final attack, clones fire a bolt that deals 70/105/750 (
) magic damage.
Attack Damage: 93 (
) [62/93/250]

Master Yi
Passive Damage: 90 (
) [60/90/550]
Passive Damage: 105 (
) [70/105/550]

Xayah
Passive: Attacks bounce to strike 3/3/5 times, dealing 60/60/30% reduced damage per target hit and leaving a Feather behind the final target.Active: Gain 75% Attack Speed for 4 seconds. At the end, recall all Feathers split between the closest 3 enemies, dealing 54/81/960 (
) physical damage each.
Damage: 81 = 72 (
) + 9 (
) [48/72/900]
Passive: Attacks bounce to strike 3/3/5 times, dealing 60/60/30% reduced damage per target hit and leaving a Feather behind the final target.Active: Gain 75% Attack Speed for 4 seconds. At the end, recall all Feathers split between the closest 3 enemies, dealing 51/77/960 (
) physical damage each.
Damage: 77 = 68 (
) + 9 (
) [45/68/900]

Bard
Summon a flying saucer over the current target that lasts 4 seconds. Each second it deals 220/330/3000 (
) magic damage to the target, plus 135/205/1500 (
) magic damage split between all enemies within 1 hex. The saucer deals 30% increased damage to Tanks.If an enemy under the UFO dies, Bard has a 15/20/100% chance to abduct them and create a 1-star copy on your bench.Meep bonus: On combat start, grant the nearest 0 (
) Meeple allies an additional Meep. Summon a flying saucer over the current target that lasts 54 seconds. Each second it deals 220/330/3000 (
) magic damage to the target, plus 135/205/1500 (
) magic damage split between all enemies within 1 hex. The saucer deals 30% increased damage to Tanks.If an enemy under the UFO dies, Bard has a 15/20/100% chance to abduct them and create a 1-star copy on your bench.Meep bonus: On combat start, grant the nearest 0 (
) Meeple allies an additional Meep. 
Fiora

Graves
Damage: 540 (
) [360/540/5555]
Secondary Damage: 225 = 180
+ 45 
[120/180/3333]
Damage: 585 (
) [390/585/5555]
Secondary Damage: 245 = 200
+ 45 
[135/200/3333]

Morgana
Passive: Heal for 20% of Ability damage.Active: Transform into Dark Form for 5 seconds, gaining 250/300/4000 (
) Shield for the duration. While in Dark Form, tether the 3 nearest enemies, dealing 50/75/1500 (
) magic damage per second to each one. At the end of the transfomation, deal 240/360/4000 (
) magic damage to all tethered enemies.
Shield: 300 (
) [250/300/4000]
Damage Per Second: 75 (
) [50/75/1500]
Delayed Damage: 360 (
) [240/360/4000]

Shen
Bonus Damage: 60 (
) [40/60/777]
Shield: 473 = 8%
+ 300 
[225/300/3456]

Sona
Damage: 390 (
) [260/390/999]
Slam Damage: 930 (
) [620/930/9999]
Damage: 420 (
) [280/420/999]
Slam Damage: 1050 (
) [680/1050/9999]

Anima
After losing a player combat, gain 20 Tech, plus additional Tech equal to 5 times the length of your loss streak. Additionally, gain 2 Tech per Anima takedown.Each time Animas get 100 Tech, they prototype new Anima Weapons. You can take them, or save your Tech to get more powerful weapons next time.(3) Start Researching!
(6) After winning a player combat, gain loot!
After losing a player combat, gain 20 Tech, plus additional Tech equal to 5 times the length of your loss streak. Additionally, gain 2 Tech per Anima takedown.Each time Animas get 100 Tech, they prototype new Anima Weapons. You can take them, or save your Tech to get more powerful weapons next time.(3) Start Researching!
(6) After winning a player combat, gain loot!
<ShowIf.TFT17_AnimaSquad_IsDoubleUp>Gain 85% Tech from losing if your partner wins a combat in Double Up.</ShowIf.TFT17_AnimaSquad_IsDoubleUp> 
Dark Lady
Allies take 5% less damage from abilities, increased to 10% while Morgana is in Dark Form.
Your team gains 5% Durability %i:scaleDurability%, increased to 10% when Morgana is in her Dark Form.

Dark Star
(2) Dark Stars create a black hole that consumes enemies at 8% max health.
(4) AND they gain 45% 
. (6) AND the strongest Dark Star unit goes supermassive, gaining 85% effectiveness from Dark Star, and creates 2 minor Black Holes.
(9) All Dark Stars are supermassive. At level 10, CONSUME EVERYONE.
(2) Dark Stars create a black hole that consumes enemies at <ShowIf.TFT17_DarkStar_HasNeutronStar>0%</ShowIf.TFT17_DarkStar_HasNeutronStar><ShowIfNot.TFT17_DarkStar_HasNeutronStar>8%</ShowIfNot.TFT17_DarkStar_HasNeutronStar> max health.
(4) AND they gain 45% 
. (6) AND the strongest Dark Star unit goes supermassive, gaining 85% effectiveness from Dark Star, and creates 2 minor Black Holes.
(9) All Dark Stars are supermassive. At level 10, CONSUME EVERYONE.

Stargazer - Fountain
Stargazers chart a different constellation every game. This game: The Fountain.Allies in empowered hexes gain 1 Mana Regen. Stargazers in empowered hexes gain more and heal the lowest Health ally with their abilities.(3) 1
, 18% ability damage heal (5) 5
, 25% ability damage heal More hexes reveal at each player level Stargazers chart a different constellation every game. This game: The Fountain.Allies in empowered hexes heal 2% max Health every 2 seconds. Stargazers in empowered hexes heal an additional 4% and gain stacking Attack Damage and Ability Power every 2 seconds.(3) 2%

(5) 4%

More hexes reveal at each player level 
Anima Commander
Gain a Briar, a Jinx, and an Illaoi. Increase your current and max player Health by 10.
Gain a Briar, a Jinx, and an Illaoi. Increase your current and max player Health by 5.

Misfits
Your team gains 55 Health for each active Unique trait. Gain a Rhaast and a Miss Fortune.0 Your team gains 55 Health for each active Unique trait. Gain a Rhaast and a Miss Fortune.0Unique traits belong to 1 champion and are shown in orange. 
Tiny Titans
Increase your current and max player health by 30.
Increase your current and max player health by 20.