Obviously I am not a designer for Avowed but just some ideas that would be awesome for DLC features-
-Custom uniques crafting
-Unique Grimoire that allows you to set 4 spells of your choice (could also be part of crafting previously mentioned)
-NEW CLASSES - Priest/Druid or Cipher
-New abilities tiers / higher level cap (hopefully cap increases already with new game+)
-COOP?? (Yeah right lol)