Trailer is good and beautiful, but the creatures are not "photo realistic" at all. Maybe on the big screen (and in 3D) it will looks better though. (like the CG Arnold in T4 who looked nice on the big screen, but kind of fake on the trailer playing on my PC. CG needs the little details to been seen)
EDIT: 720p and 1080p version looks way better.
Some movements still looks odd to me but the level of details of the CG characters is very good. I guess I need to get used to the design.