Crytek's Homefront: The Revolution is the sequel to Homefront - a game in which North Korea successfully invades the USA. The sequel maintains that level of realism...
You can check out all the gory yet strangley hilarious details on our game page
but suffice to say there will be killing and blood and plot that revolves around this, "open-world first person shooter where you must lead the Resistance movement in guerrilla warfare against a superior military force. A living, breathing, open world responds to your actions - you and your Resistance Cell can inspire a rebellion on the streets and turn Occupation into Revolution, as oppressed civilians take up the fight."
The game is due out on Xbox One in 2015.More info here.