Paladin is 100% AoE req.

Warrior seems to be an upgrade to vengeance.

Gunbreaker is a continuation on fated circle, you can see the gnb use FC as the camera is moving.

Dark knight there's no telling. You can see the DRK use a lot of new animations so it could be it's getting a visual upgrade to its 1-2-3 combo, it could be a new combo, it could be an upgrade to edge or flood or shadowbringer. There's no telling there.