The latest feature for GameInformer's exclusive The Witcher 3: Wild Hunt coverage is dedicated to showing the mocap for the title's animation. Not much to describe there, aside from the fact that they're aiming for Geralt's movement to be crazy and "movie-like" while the normal NPCs will adhere more strictly to realistic swordsmanship, so I'd just direct you to GameInformer to watch some animations that may end up in the final game.