Activision has confirmed that Onslaught's 28th January release is exclusive to Xbox Live, of course.Furthermore, it's detailed exactly what the add-on entails. Onslaught will include four new multiplayer maps, the all-new Maverick dual-purpose Assault Rifle/Sniper Rifle, and the first episode in the four-part alien-based Extinction story arc, Nightfall.Featuring two new characters and a couple of new species of alien, Nightfall is set in the Alaskan wilderness where soldiers are tasked with eliminating an extra-terrestrial menace. It's said to contain a three-story tall monster, so look out for that.The new maps include: Fog, a slightly smallish stage set in a misty mire; BayView, a smaller battlefield comprised of a California boardwalk; Containment, another smaller map set along a South American dry river bed; and Ignition, a stage set around a Florida space facility where players can trigger rocket launches on their enemies.Each of Call of Duty: Ghosts' DLC packs will be priced at $14.99 (about £9), or can be purchased at a reduced price by buying the season pass for $49.99 (about £30).

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