DF conducted a thorough breakdown of the X10 video, monitoring the frames-per-second (fups, as us cool kids call it) in all of the presented gameplay. All in all, the ViDoc seems to have spoken the truth: Halo: Reach's engine is a significant improvement over that of Halo 3's. It looks like Reach should run at a smooth 30fps, the same as its predecessor, at a higher resolution: 1152x720 over Halo 3's 1152x640. Yep, you pixel-counters just read that right. Head on over and give the video a gander.