Guys, I found more info.
It is a New cold war, USA VS China -the rason, the rare elements.
In the chaos, the main villian will be a Nicaraguan guy which will somehow get control of the drones and made them attack USA, USA, in the confusion will think it was China, so they send their drones to attack China and thus starting another war.
http://www.gameinformer.com/games/ca...ck-ops-ii.aspx
Check this article out, it talk more about the story.