A beta has been release for UT2K4, http://www.fileplanet.com/files/130000/136843.shtml I've only tried the assualt map, but its pretty damn good
I have played it quite a bit online since the release of the demo. Onslaught is probably my favorite addition. Assault is pretty cool and the Bridge of Fate CTF map is nice also. I am really waiting for the full game to come out now. If any of you are playing, I am usually on the Official Atari servers as Overmind1984.