A big announcement on Wowhead states that World of Warcraft: Wrath of The Lich King will be released on November 13th. There is no official statement yet, but judging by the nature of the announcement, we can say this is the real deal (thanks Blues).
Update: the announcement is now official, so press 'read more' and check the press release for details, including the details on the Collectors Edition version of the game.