Along with classic you get Tranzit, which features a single enormous city map that up to four players can traverse via a still-functioning bus system or by picking a direction and walking. The city and transportation options not only provide a variety of locations and defensive options, but also items that can be collected to craft weapons or tools. “Because it’s open and because there are multiple locations in this world where you can play and where the infestation is, there’s different strategies about how you can approach it,” Treyarch’s Mark Lamia explained. “It’s a much bigger world with much more going on.”
AND
Grief which deposits not one but two human teams into the map, each with the goal of outlasting their opponents. Players will not be able to kill each other outright in Grief mode, but they can use the environment to trap the enemy team with the zombie horde.
Along with the new modes you can have custom gametypes. Make it headshots only. Turn power ups off. Start the game off at a certain level.
Treyarch also said Zombies will have a story(doesn’t look like it will involve the crew from WaW and Blops) but they didn’t say how it will be seen in game.