Here is the weekly Blizzard post and datamined changes for the Warlock Talent Trees on the Dragonflight Alpha.
Dragonflight Talent Calculator
Blizzard Post
From today’s Alpha update notes:
Soul Conduit refund chance reduced to 10% at max rank (was 15%).
Destruction
Backdraft now affects Soul Fire.
Datamined Changes
Class ToolsAfflictionTalentsDemonologyTalentsDestructionTalents
Talents (17)
Corruption is now permanent and deals 15% increased damage.