As im sure EVERYONE knows, the werewolf / deathclaw model and animation share almost EVERYTHING with the deadroth from oblivion.
And to me the new vampire looks alot like the imp from oblivion
EDIT: Also the vampire that explodes into bats in the trailer loots alot like the skyrim spriggan. you know, when it dies and the tree... magic...whatever flys out of it?






If we're going that route, Imp/Vampire looks like a downscaled Pit Lord without a weapon from Diablo 2.