The Torment:ToN video showed off a movement/animation system using irregular speed and inertia. ("improved on PoE technology, or something like that)
Maybe not for combat, but for just moving around, I would really love to see that being traded back to PoE. PoE's animations are fine, they do the job, but they look robotic and especially compared to Torment's movement, they just hurts the eyes a bit. I understand in RtWP combat these would change the mechanics too much, but for out of combat movement, they'd be wonderful to have.
It's super late in development, I realize that. But, perhaps it could be applied as a patch after release.