User blog comment:KATANAGOD/Black Ops II Zombies Hinted on Twitter/@comment-4936334-20120503213943

It's obvious zombies is coming back. It's a huge selling point in Treyarch's games. Another hint at zombies coming back is in the reveal trailer at 1:17-1:19. In the background you can see the light that shows where the mystery box is on the bigger maps. [http://www.youtube.com/watch?v=x3tedlWs1XY The video. (If you don't already know how to find it :P)]