The next DLC map pack for Call of Duty: Ghosts is called "Onslaught", and its coming on January 28, 2014 on Xbox Live.
GameStop recently put up a massive promotional poster for Call of Duty: Ghosts Onslaught DLC detailing all the contents it will offer.
You can take a look at the poster below. As per the details on it, Call of Duty: Ghosts Onslaught DLC will feature four multiplayer maps: "Fog, Ignition, Containment and Bayview".
In addition to this, CoD: Ghosts Onslaught DLC will also offer bonus weapon Maverick AR and Sniper Rifle and Extinction Episode 1 Nightfall.