Wowhead.com is running an advert on their homepage for Wrath of the Lich King, with a release date shown as 13th November 2008. While Blizzard hasn't confirmed this date, Wowhead's developer Skosiris has said this is an official Blizzard advert.

As part of being the first place to show any signs of a WotlK release date they are href= http://wotlk.wowhead.com/?contest=raffle-of-the-lich-king" target= _blank >raffling off 10 beta keys between Today and Friday.