Call of Duty Ghosts, Onslaught DLC is free to play this weekend. Starting from Friday 21st to Monday 24th, a free trial version of the map pack will be available to download for Xbox 360 and Xbox One.
It contains the following:
All four of the new maps: Fog, Bay View, Containment and Ignition
The new Maverick weapon.
Nightfall, the first slice of a new four-part story campaign