SP: UT will feature the same levels, weapons, vehicles, and game types on each platform. Having said that, the game will not feel identical on each platform, as we've tweaked the game for each platform so as not to compromise the game play on any system. The game plays a bit slower on the console versions, and there is some aiming help (although the system we've developed, while very effective, feels quite subtle). Visually, the game scales very well to a wide variety of hardware. We've always placed a lot of emphasis on getting UT to run well on lower end hardware, and we've also got high end features to push your monster PC to its limits.
And of course, we'll be supporting mods on both the PC and PS3. Mod support has always been an important part of our success on PC, so we're very excited to be able to bring this feature to a console platform.