The Quake 4 1.3 Point Release has been released:

www.idSoftware.com

UPDATE: All QuakeCon 2006 Quake 4 tournaments will be using the 1.2 Point Release due to the limited amount of time available for players to adjust to the new gameplay changes, however, all BYOC servers will be running the 1.3 Point Release, so it is suggested that everyone patch to 1.3 except for those who may wish to keep a separate 1.2 copy for use of practicing prior and during the tournament.

UPDATE: The following files are now available:
UPDATE: 1.3 ReadMe


Torrents:
zerowing.idsoftware.com

More mirrors are being added as they come up.