With an expansion announced however not releasing any time soon, do you think that releasing another character would be on the horizon for D3? Personally I'd love to see a new class as a preview of something they intend to release in D4. Perhaps an unannounced class such as the Assassin. Currently we only have three dedicated melee classes, so adding another would make sense. Again, these are just my thoughts, but continuing to keep D3 fresh whilst working on an expansion seems a smart move for blizzard. Give us another reason to drop however much on this game, and keep us sated until they can finally release D4. Hell, it might even buy (no pun intended) them a bit more dev time on D4 as we'd have something fresh to keep us occupied.
I don't know where you got your information but the D3 is in the hands of the classic games team for a long while . The second expansion was canceled and bits of it were released for free in patches while the new class, necromancer was released as paid dlc.
There is no new xpac announced for d3, nor any future support aside from tech support, new infinity power creep 100000000% item changes and some new sets that will in no way make me reinstall d3 again.