As much as some Blizzard reps might have wanted to play coy on the official forums, the official World of Warcraft site leaked a link to Pre-order Wrath of the Lich King which will -- according to the page -- indeed come out on November 13, 2008. So while there has mysteriously been no big announcement on the Blizzard websites, this Pre-order page pretty much confirms what Wowhead and Thottbot unveiled earlier today.
Participating retailers include Amazon, Best Buy, Circuit City, and GameStop. Interestingly enough, all the official links except for Best Buy peg the official release at November 3, a date leaked out in earlier reports. GameStop words it as "ships in 11/03/08" which could mean that the games will reach retailers over a week before the official release date. [EDIT: Or yeah, it could be that they haven't updated their sites yet. Good morning!] The details include both normal and Collector's Edition versions of the game. The official Blizzard site has, as of this writing, now been updated to reflect the official release date with a splash page.
[UPDATE: GameStop has revised their release date to match the announced date of 11/13/08]