I'm sure that since it was such a success in world at war that the next time Treyarch makes a call of duty game they will throw a new version of zombies in with it.
And if they don't then send all the complaints you can to them so they will make it with the next one.
I reckon that if call of duty had zombies in it's new version, there should be things like:
-Instead of just packs of zombies there should be hordes all over the map and the ma goal was to survive.
-Ammuntion can be found but most of it should be dropped in supply crates that (On multiplayer) all of the players had to find away to it before the horde gets around.
-It should show how many zombies there are, how many each person has killed and the estimate of how many each player should kill i.e. Est. Zombie= 4,593,873 PIA (Players in area) = 18 Kill requirement= 250,000
- And online instead of having a lobby, there should be an outpost area where each player starts (But there should obviously be more than one) barricade supplys should be able to be called in after so many minutes of defence.
-No respawn, you die.... you dead.... you go back to outpost and wait for another game.
-you buy ammo..... you run out.... your fault.... you don't call for back up (Other teammates) .... you use a knife.... you die... you dead.
Just a few ideas that would make the ultimate online zombie game with aspects of call of duty...
-.-