UPDATE: 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.
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