Gnomes will probably go the most right, as they can base them somewhat off of goblins, which are animated quite well.
Humans could come out wrong. We haven't really seen much NPCs with much of an improvement on the current model. Given that we all are humans, it's really easy to pick off anything wrong with them. Women are also hard to get right too. Ask anybody who has dabbled in art, and they can tell you that.
What I really hope to see is the ability to adjust the dimensions of the models. Weight and height, as well as skinny, muscular, or fat. And even options that can show age or youth. That might be a lot to ask for though, considering the variety of races in this game.