User blog comment:JAlbor/Wikia at E3 2012/@comment-86.18.152.175-20120522195224/@comment-1888015-20120526225243

It's doubtful. Ubisoft probably wouldn't have had Microsoft remove Co-op from the game's listings if it was going to happen.

They might have had to reveal it early if it was leaked, but they could still be keeping it under wraps.

We'll just have to see.