The engine they're using was created to work with all platforms regardless. There is a large chance this game was destined to be multi-plat for a while. If they have a tweaked out version of the engine which specifically uses the PS3's resources, then we should be ok. But they WILL try to make these games similar, so I do have a fear they will cut-down on resource potential.
From 0 to KICKASS in .stupid seconds.