No, you can only play with real people in Black Ops 2 Zombies mode. You can play with computers in Multiplayer although.
No there can not be 4 players on Call of Duty Black Ops Zombies on PS3 offline.
Yes
you cannot only on live or link
Yes you can.
zombies 4 and multiplayer 18
Yes, but only in multiplayer and zombies
Yes. If you use the same system, that is
Yes. You go to multiplayer and select 4 players. You need 4 controllers though.
Yes, treyarch is using the multiplayer engine so Zombies will be able to support 8 players.
it is not in zombies
No, you can do offline solo/split screen or online with three other players.
you go to the computer and type "3arc unlock"