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: Oct 31 7PM

Kai'Sa

Katarina

Rammus
Shield Amount
[525/625/725]
Shield Amount
[550/675/800]

Jarvan IV

Radiant Kraken's Fury
Attacks grant 8% stacking Attack Damage, up to 15 attacks. After 15 attacks, gain 80% Attack Speed. Attacks grant 7% stacking Attack Damage, up to 15 attacks. After 15 attacks, gain 80% Attack Speed. 
Healing Orbs I
When an enemy dies, the nearest ally is healed for 200.
When an enemy dies, the nearest ally is healed for 220.

Healing Orbs II
When an enemy dies, the nearest ally is healed for 400.
When an enemy dies, the nearest ally is healed for 440.

Raid Boss
Your strongest Bastion champion gains 25% max Health. When other Bastions die, they transfer 20% of their Armor and Magic Resist to it. Gain a Shen and Rell.
Your strongest Bastion champion gains 20% max Health. When other Bastions die, they transfer 20% of their Armor and Magic Resist to it. Gain a Shen and Rell.
After 4 seconds, Stun enemies within 3 hexes for 1 second. Repeat every 9 seconds.
After 4 seconds, Stun enemies within 3 hexes for 1 second. Repeat every 8 seconds.