I'd love for a slew of new customization options across the board. Double the faces for everyone except midlanders (just give them 2 more each to bring up to the rest), Muscle/Bust sliders for every race (except Lalafells, lets give them something different, maybe an ear slider), Horns for Au Ra separate from the face, markings for miqo'te separate from the face, etc...

I know its a long list, but I'll have a little hope it'll come in 4.0. If not, hey, I'll wait for 5.0.