I noticed on some of the leaked content i have seen there is a "Zombie maps" menu which has not been displaying deadops arcade i remember in blackops 1 this mode was unlockable through typing a code into the terminal after you stood up in the main menu(Five aswell)

I was just wondering if anyone knew if there were any other maps than shadows of evil that will be unlockable through codes or completing content ingame?
also i have read that deadops arcade will be returning that is what has kind of got me wondering.

Thanks