The new sequel to UT2004, UT2007, looks awesome. The old vehicles have been updated and new vehicles and a hoverboard have been added. Sounds like it'll be out sometime end of 2006/beginning of 2007.
There's a link to some of the videos at the bottom of the page here (seventh video from the bottom of the page). It contains a few videos of the new game.
http://www.gamespot.com/e3/e3live.html