User blog comment:Argorrath/Treyarch releases a BO2 teaser video called "Origins" for DLC 4/@comment-14874900-20130808095644/@comment-1187559-20130808115054

That's referring to if the characters die, since it was the last map in the WaW zombies maps. You can't think when they made Der Riese they had it planned that in 3 years they'd go back to it.