It'd have to be a pretty damn big story for it to be just single player, don't get me wrong, I LOVE the single player, but I also like playing online with friends. I'd want it to be more than 5 hours long, that was my only problem with 4, too short. I wouldn't mind if they had a 15 hour campaign. They need to do what other games tend to be doing now, a disc for single player, then a disc for multiplayer. That way they can expand both all the way on the disc instead of half/half.