User blog comment:Callofduty4/Black Ops 2 campaign demo, much info released/@comment-65.128.254.167-20120523070705/@comment-1726879-20120524054753

As far as I can tell, they are seperate "universes" with the same brand name. However, as they've done before, they can just post "easter eggs" in there to make it seem like they share events or characters (like the whole "Jonathon the young SAS operative" thing)