UT3 is building up to be a very strong new part in this franchise. Making use of Epic's new Unreal 3 engine, that already showed it's power in Gears of War.
The game even shows it in parts, walls, grounds, stairs, much reminds of Gears of War. The gameplay is different though. No cover system, megafast moving and a game that attracks a different kind of shooterfan. This interview with the President of Epic from Gametrailers, shows many weapons, surroundings and just a lot of new gameplay.