I'm really surprised so many people care strongly one way or the other about the game graphics in one picture. Saying a still image is being rendered in real time by the new engine doesn't mean much at all, especially when they've also said most of the optimization is in rendering a large number of people and effects and such. Every game made to this date can produce screenshots where a shadow is out of place or you see jagged edges or something else that's slightly off, not to mention the question of how fast it's running while delivering that, or what settings are currently being used and what the range of options actually is. Who even can say what all those effects in the picture actually look like?

The test of a game engine will come from seeing it in motion, not from whether or not you think you'll be able to make wallpapers out of it.