Honestly I am not sure how much additional dps WHM's are going to offer above what they can sustain with their current heals. The lvl 70 skill is reliant on building Confession stacks on targets which requires casting cure on them so its a lot of build up for it to be useful. Unless there is a lot more incoming damage I don't see many of these new mechanics being particularly needed. Even building Lilies requires casting Cure and Cure 2 and in a lot of content your not going to be doing that that much since regen and Medica 2 covers most basic healing.

AST on the other hand still has its buffs but now cards it cant use can be turned into a 500 pot heal or a 300 pot attack.

Yeah, honestly I am feeling rather underwhelmed but we will see when they are finally seen in action. It will require quite a change to the gameplay for WHM's new skills to be that useful over what we already have.