According to the video embedded below one new aspect of the Zombie Co-Op mode is the ability to play as Fidel Castro? This game gets more interesting by the day.

EDIT: Activision took down the YouTube video but here is another one from Viddler.

In the meantime you can get your zombie killing on our Rising server: 24.186.222.45:28970

We’ve upped the ammo on the mod from the default. Enjoy.