http://xbox360.ign.com/articles/804/804991p1.html

Overall, the Xbox 360 shone at E3. Once you get past the bad press conference, it was smooth sailing for Microsoft's beast of a console. The only bad news was the announcement that Unreal 3 was heading exclusively to PC and PS3. That was a pretty big blow for a system known for first-person shooters and great online multiplayer. Fortunately, there are a lot more games that will take up your time this year and next.

Unreal is a timed exclusive. it will come out on 360 in 2008.

http://www.gamespot.com/pc/action/unrealto...lyadded;title;2

That sucks waiting an extra half year for the game. I just hope its worth the wait.