http://xbox360.ign.com/articles/754/754176p1.html
IGN hunts with ghosts. First impressions, new screens, and first in-game video. Oh yes
...To be honest, its looks are a little deceiving. The visual improvements are subtle on one level, huge on another. At first look, you'll initially see very little. The character models are slightly more detailed and the vehicles all look decent, but if you look closely at the environment textures, you'll see a marked difference. The variety and detail is impressive. The first couple levels I played didn't really show off the changes I had hoped to see. By looking closely, improvements in shadows (you'll see full, complete shadows), transparencies, and a torrent of special effects (heat blurs, lens flares, particles, animations) will slowly show themselves....