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

The answer has been right infront of us this whole time, der riese = the giant = the robot (also) = the giant, even in the der riese level description it says 'this it where it began, will it be where it ends...'