those screens sure look awesome!
I'm afraid tho, that they are being rendered with higher quality settings than we'll see during actual play.
probably the texture resolution, texturefiltering, the antialiasing and the plane models have the highest LOD in these screenshots.
like this screen from Halo3
If you played Halo3 you that it does not look that good during play
I hope BoP have some antialiasing on the planes during play, but dont think the xbox/ PS3 are very good at that