User blog comment:D. Cello/Assassinews 02/16 -- AC3 date released/@comment-4524035-20120219220725/@comment-3096856-20120220185445

Actually Ubisoft could add co-op, like in Portal 2 or Splinter Cell Conviction. They've done it before and thay can just have a separate storyline that ties in with the singleplayer story line in some places. Though this would probably only work in modern times.