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: May 15 1PM
Live
PBE
Sterak's Gage
Once per combat at 60% Health, gain 25% max Health and 35% Attack Damage.
+15%
Attack Damage
+150
Health
Lifeline: At 60% Health, gain a Shield equal to 60% of the wearer's maximum Health that rapidly decays over 6 seconds.
+40%
Attack Damage
+300
Health
Guinsoo's Rageblade
Attacks grant 5% stacking Attack Speed.
Gain 7% stacking Attack Speed every second.
Statikk Shiv
Every 3rd attack deals 35 magic damage and 30% Shreds 4 enemies for 5 seconds.Shred: Reduce Magic Resist
+15%
Attack Speed
+15
Ability Power
+15
Mana
Attacks and Ability damage 30% Shred the target for 3 seconds. This effect does not stack.Shred: Reduce Magic Resist
+15%
Attack Speed
+25
Ability Power
+15
Mana
Runaan's Hurricane
Attacks fire a bolt at a nearby enemy, dealing 50% Attack Damage 
as physical damage.
as physical damage.+20%
Attack Damage
+10%
Attack Speed
+20
Magic Resist
Attacks grant 3% stacking Attack Damage.
+15%
Attack Damage
+10%
Attack Speed
+20
Magic Resist
Redemption
Heal allies within 1 hex for 15% of their missing Health every 5 seconds. They also gain 10% Durability for 5 seconds (this does not stack).
+15
Mana
+150
Health
Regenerate 2.5% of missing Health each second.
+15
Mana
+200
Health
Guardbreaker
After damaging a Shield, gain 15% additional Damage Amp for 3 seconds.
+20%
Attack Speed
+10
Ability Power
+150
Health
+20%
Critical Strike Chance
+10%
Damage Amp
Critical Strikes grant 5% Damage Amp for 5 seconds, stacking up to 4 times.
+20%
Attack Speed
+150
Health
+20%
Critical Strike Chance
+10%
Damage Amp
Sterak's Megashield
Once per combat at 60% Health, gain 40% max Health and 60% Attack Damage.
+30%
Attack Damage
+400
Health
Lifeline: At 60% Health, gain a Shield equal to 100% of the wearer's maximum Health that rapidly decays over 8 seconds.
+80%
Attack Damage
+600
Health
Guinsoo's Reckoning
Attacks grant 10% stacking Attack Speed.
+20%
Attack Speed
+10
Ability Power
Gain 14% stacking Attack Speed every second.
+20%
Attack Speed
+20
Ability Power
Statikk's Favor
Every 3rd attack deals 95 magic damage and 30% Shreds 8 enemies for 5 seconds.Shred: Reduce Magic Resist
+20%
Attack Speed
+50
Ability Power
+15
Mana
Attacks and Ability damage 30% Shred the target for the rest of combat. This effect does not stack.Shred: Reduce Magic Resist
+30%
Attack Speed
+50
Ability Power
+15
Mana
Runaan's Tempest
Attacks fire a bolt at a nearby enemy, dealing 100% Attack Damage as physical damage.
as physical damage.+40%
Attack Damage
+20%
Attack Speed
+20
Magic Resist
Attacks grant 6% stacking Attack Damage.
+30%
Attack Damage
+25%
Attack Speed
+20
Magic Resist
Absolution
Heal allies within 2 hexes for 25% of their missing Health every 5 seconds. They also gain 10% Durability for 5 seconds (this does not stack).
Regenerate 5% of missing Health each second.
Willbreaker
After damaging a Shield, gain 30% additional Damage Amp for 3 seconds.
+30%
Attack Speed
+30
Ability Power
+150
Health
+20%
Critical Strike Chance
+20%
Damage Amp
Critical Strikes grant 10% Damage Amp for 8 seconds, stacking up to 4 times.
+40%
Attack Speed
+150
Health
+40%
Critical Strike Chance
+20%
Damage Amp
Mogul's Mail
Grants 1 Armor, 1 Magic Resist, and 7 Health when taking damage, stacking up to 35 times.At full stacks, grant 
1 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]
1 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]Grants 1 Armor, 1 Magic Resist, and 10 Health when taking damage, stacking up to 35 times.At full stacks, grant 1 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]
1 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]
Lich Bane
The holder's first attack after each Ability cast deals 200 / 270 / 340 / 410 / 480 bonus magic damage.Damage increases based on Stage.
The holder's first attack after each Ability cast deals 240 / 320 / 400 / 480 / 540 bonus magic damage.Damage increases based on Stage.
Wit's End
+30%
Attack Speed
+30
Magic Resist
+30%
Attack Speed
+30
Armor
+30
Magic Resist
+300
Health
Mogul's Mail
Grants 1 Armor, 1 Magic Resist, and 7 Health when taking damage, stacking up to 35 times.At full stacks, grant 3 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]
3 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]Grants 1 Armor, 1 Magic Resist, and 10 Health when taking damage, stacking up to 35 times.At full stacks, grant 3 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]
3 gold and continue gaining 1 gold every 8 seconds.[Unique - only 1 per champion]