Read the full announcement.Several hints over at vbulletin.com are pointing to a possible release of vBulletin 3.5 GOLD today
Do yourself a favour and go over vbulletin.com and have a peek at these threads:
http://www.vbulletin.com/forum/showthread.php?t=150092
and
http://www.vbulletin.com/forum/showthread.php?t=148276