User blog comment:Argorrath/Treyarch releases a BO2 teaser video called "Origins" for DLC 4/@comment-10261308-20130807060053

I think it's pretty solid they're making an all Zombies DLC, with the success of Rezurrection, they can't just NOT do it. If they made 4 more Multiplayer maps they'd have more DLC Maps than Standard. Which is something they can't do. Having 5 zombie maps would fit into having 5 DLC items. Getting the old crew back with the letters. Everything fits.