User blog comment:Drkdragonz66/Call of Duty Ghosts confirmed to have an unknown cooperative mode/@comment-3967954-20130711224145

Hmm, as unlikely as a co-op mode would be (the E3 gameplay didn't look designed for co-op at all), the suggestion that it might not be announced at least hints at campaign co-op (campaign co-ops rarely have clear announcements; it's just an added extra these days). Unless, of course, IW are trying their hand at a hidden Nacht der Untoten-esque mode.