One question I have been wondering and nobody seems to really know is that will Xbox 1 and 360 users be able to play against each other? This really determines if it’s worth upgrading to xbox 1 or to xbox 1 COD as many of my fellow coworkers are not upgrading to xbox 1 until next holiday season.
You definitely can't on the Sony systems but I don't know for sure what the answer would be for Microsoft. I'd imagine that it would be the same but that's just an uninformed guess on my part.
Simple answer is to get the digital combo pack. $10 more gets you the digital version for both consoles, play with your friends on 360 til they upgrade, and play with new friends on X1 in the meantime.
the only thing you can do, if you have 2 xbox, then you can plug one ito the xbox one, but that means buy 2 of every gane.