Here are the datamined class changes for Patch 10.0.5 PTR build 47481 which includes Feral Druid buffs, Holy Priest buffs and much more!
Class ToolsHavocTalentsVengeanceTalents
Talents (2)
Leech increased by 5%.
Gain an additional 5% Leech while Metamorphosis is active.
Rank 1: Leech increased by 5%.
Gain an additional 5% Leech while Metamorphosis is active.
Rank 2: Leech increased by 10%.
Gain an additional 10% Leech while Metamorphosis is active.