Blizzard Community Manager Eyonix has just posted on the Wrath of the Lich King Friends and Family forums that the Alpha testing has ended!
Unfortunately, you can't see his post if you don't have an account that's been selected for the F&F alpha, and we won't post the message in case it infringes the NDA at all, but we all know what this means - the WotLK Beta can't be far off!