User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-66.87.118.219-20130802030327/@comment-4232106-20130803064327

The disc won't have enough RAM to put all the BO maps and PTG said that there will not be any old maps (PTG predicted Buried and treyarch gives them info so it's safe to assume that the answer is no)