User blog comment:Argorrath/Treyarch posts a message of zombies; possibly hinting to a DLC 4/@comment-5213593-20130801050050/@comment-69.211.96.24-20130802033957

Well you gotta remember that in black ops 2, they're the same age as they are in black ops 1, due to the fact that Richtofen's Grand scheme is a couple of months before Tranzit.