I highly hope it will have 8 players. I know what you mean - 1 team with all 8 players that fight against zombies, a classic game we know from codwaw and BO but expanded up to 8 players this time. There is 4v4, but that's "not" a real 8 player game. If Treyarch is smart, they shouldn't limit classic mode to only 4 players but up to 8 instead. We will see if they surprise or dissapoint us in this mater. I know I would like this a lot more than 4v4.
So far I know, it is not confirmed yet, there are lot stuff to see about this. I read that 21st is when we will find out more info, I would like everything to know about BO2 zombies because I don't care about campaing, strike force or even multiplayer. For me is zombies game straight all the way, especialy 8 player classic mode.