The date is finally set. Wrath of the Lich King will be released November 13 2008. Make sure to pre-order your copy now!
Only about two months away from the release of Wrath of the Lich King means that patch 3.0.2 will most likely go live sometime around the middle of October.
The source is a huge advertisement over at Wowhead which says "IN STORES 11.13.08". Since said site is an official Blizzard fansite, it's safe to say that this date is definite.