WOW: WWI '08 and BlizzCon '07 Opt-Ins Closed

From worldofwarcraft.com

We are no longer taking Worldwide Invitational '08 or BlizzCon '07 beta code registrations for the Wrath of the Lich King beta. Those that still have unused cards will be able to use their code to claim their pet if they have not already done so.

Future beta registrations will be opened after the week of November, 13th.