From what i've read you'll be playing as D.Mason alex mason's son (black ops 1) It will be about a war between the usa and china.
The game is set in 2025, as opposed to the Cold War setting of Black Ops. In this new setting, China and the United States are locked in a cold war after China bans the export of rare earth elements following a cyber-attack that cripples the Chinese Stock Exchange. War is now defined by robotics, cyber-warfare, unmanned vehicles and other modern technology. The game's story deals with the speculation that this unmanned technology could just as well be used against those it was meant to protect.