I would like to say, there's a distinct lack of breast physics in the trailer. I know it's just a trailer, especially a teaser; but if everything else is going to have physics I don't see the point of only having one part on the body not have physics applied. Even if it's in a very small way, subtle, barely noticeable if that. It just doesn't look realistic. (Realism in a fantasy game, I know. Sue me)
All in all though I think it's a fantastic teaser and can't wait for the real trailer :)
