"The Xbox 360 release will contain five new exclusive maps those other platforms didn't get, two new characters and will include two player splitscreen action. All that and it also sports all of the downloadable content that Epic has created for the PS3 and PC."
In an interview with IGN, Jeff Morris, Senior Producer at Epic stated the following, in regards to why the game will pull players away from Halo 3 and Call of Duty 4.
"SPEED! UT3 is a zero time to spectacle game, meaning that when you spawn into the world, you're instantly in the action. Vehicles are exploding, robots are blowing apart lizard monsters, just non-stop CARNAGE! We're an unabashedly twitch game. Your targeting reticule doesn’t expand when you move, so you can be just as accurate with your weapons whether crouching in a corner or jumping off a bridge. UT3 doesn’t have a spawn queue, so when you die, you're instantly back into the action. I think UT3 is just what the doctor ordered for people suffering for the accursed affliction of Tactical Shooter Fatigue."