User blog comment:Crazy sam10/Call of Duty: Ghosts Launch trailer leaked and pulled/@comment-176.75.24.31-20131022102328/@comment-3563664-20131023135336

They have some kind of survival thing going on though. I think they probably didn't specify anything because they don't want people to instantly say "man that looks bad I want zombies!!1!!!1!!" but instead have them play it first.