From the Official UT2k4 Website:

We will be releasing the US version of the UT2004 demo today. It will include 5 maps (AS-Convoy, ONS-Torlan, DM-Rankin, CTF-BridgeOfFate, BR-Colossus), 6 game modes (Assault, Onslaught, Deathmatch, Capture The Flag, Team Deathmatch, Bombing Run). It will be 209 Megs so please check back later today to download it.

Sure Enough! Download it now!

WooHoo!