Imagine Gears of War 2's Horde Mode combined with Left 4 Dead's escape-the-zombies gameplay and you'll have something similar to—but not exactly like—Army of Two: The 40th Day's new multiplayer mode, Extraction.
Extraction comes as a bonus multiplayer mode for GameStop pre-order customers. But don't fret — the rest of us will get the mode 30 days after the game's release. Be glad they didn't make that 40 just to stick to theme.
You'll notice fabulous masks in this trailer. If you enjoy them, be glad to know that you can turn on user-created content (such as the mask, armour or weapon customisation options) in all of the multiplayer modes to make your posse of two stand out that much more. If you don't enjoy them, savour the part where you can turn user-created content off.
Stay tuned for an actual preview.