I remembered that before black ops 2 release i did a lot of searching about what is zombies, campaign and multiplayer gonna be.
Then i remembered this picture being posted, which might be the new zombie map:
I have seen a video where a guy shows which maps might also be in the dlc. "Express", on the train you see a sign "tru´transit" being familiar with game mode tranzit. Train might work the same way like the bus does, waits for a 30-60 secs and then goes into another location.
Picture looks a lot like aftermath, but since this was posted under zombies, this might be the new map.