User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-5394014-20130731085522

The next Zombies map could really be in the past, we could be able to play with Richthofen, Dr. Maxis and two other guys. They would realize there that Element 115 turns people/the dead into Zombies (I know it doesn't really fit into the timeline, but there could be something we didn't know?).