Those are not 360 screen shots. The 360 can't anti-alias smooth lines like those shots feature. It probably isn't PS3 because developers are just now figuring out anti-aliasing techniques that would look that clean. So what does that leave . . . PC.
The screenshots of Rage featured in GameInformer are from the PS3. That is where they discuss the PC's superior anti-aliasing ability. They also mention that the PS3 is more powerful yet harder to program for than the 360, but I think everybody knows that by now.
Fuck... I'm dead!