The promised Titan update for the PC release of Unreal Tournament 3 has gone live alongside patch #4 which takes the game to version 2.0 (with the latter presumably required for the former) and is available over Steam or via manual download (mirror 1 | mirror 2) if you haven’t registered your retail key with Valve’s service.
Steam downloads relating to the game seem a little slow given the huge number downloading the game following the announcement of a Free Weekend for the game, coupled with a 40% discount whilst the trial is on.
The good news doesn’t extend to the PS3 release of the pack, which has been delayed due to certification and is, according to Eurogamer, due on the 19th.
No word on any update for the 360 version, although a chunk of the Titan Pack is made up of that releases content.