Valve writer Chet Faliszek stated in an interview with CVG, ”If you bought the PS3 and Xbox 360 versions and put them side by side you can see they’re identical games. The actual content is the same too across all platforms.”
The only difference will be the PlayStation 3 version’s Steam backend, which will allow faster updating. ”With the PS3 we can update more often, we don’t have to have someone else gate that ability. We can play between the PC and PS3 players because we can update more frequently. That’s our thing, we don’t want to hurt (either PS3 and PC users playing cross-platform) and now that we can update more frequently it’s easier for us to avoid that,” Faliszek reported.