I hope they add more mobs period. Less crabs please.
Let's hope! With less limitations they'll be able to make unique mobs across the board and not have to stay with base frames that just get re-skinned as they vary in difficulty.
They did what they could with what was available to them at the time in XI but now they have a pretty clean slate in terms of where they can take the creativity as far as enemies are concerned.
They did this too with different armor in XI, alot of the same skin, slight variation or color change, saving the unique styles for rare and hard to obtain pieces.
I'd have to agree with someone above me here and say that the Orcs were pretty scary, while the Quadav not so much.