The video on the top left of them all is gameplay footage.
Wow. I've never seen anything like it. It looks frighteningly realistic, in terms of graphics and sound effects.
I think MGS will always lead the pack with games. The first one was the best, until the second one came out. That set a standard which hasn't really been challenged since, admittedly, not even with the third one. It was a brilliant game, but not different enough from MGS2.
Still, I think this is bound to be the main game of all three of the next gen consoles. Forget GTA.