I say they go back in time to try and stop the zombie apocolyps and the dont go back far enough so they have to fight of the zombie horde. Once they finnaly reacht hey right timezone where and whenever that is finnaly in the last map you are given an objective that says find and kill edward richtofen. BTW Richtofen is not with them the person from the blank portrait in kino is with them to replace richtofen.
% maps in new game Treyarch is awsome at making maps so i will let them come up with the maps but I want to have Leveling, Easter Eggs, Achievments and Titles! please take some of these ideas!