Its a movie scene, thats obvious... BUT that doesn't mean its prerendered!
With what the PS3 should be capable of, I would expect nothing less than this quality out of the next gen! Take a look at the Xbox 360 graphics, those are in game, and this looks perfectly beleivable to be in game graphics compared to that. I base this on my beleive that the PS3 will be better than the Xbox 360.
Only with more info will we be able to see if this is truely what the PS3 can do... And if it isn't in game footage... then I feel sorry for Sony.
I truely expect nothing below these graphics. lol
On another note... you can NEVER trust screenshots from Sony or Microsoft, cause they photoshop them to make they look better. Granted, it doens't help much... but its missleading and should be considered cheating. XD