it's basically the COD4 engine with a lot better physics and better lighting: buildings are destroyable and burnable, skin melts off bodies, etc. it'll probably look really sexy in, you know, motion. I'd imagine that they're designing it so that after you attack an area, it's unrecognizable from when you first saw it (forests/villages burned down and bunkers reduced to rubble and whatnot). the only not-so-good thing I see is the texturing but COD4 was pretty weak with that too.