Alan Wake's American Nightmare will headline this year's Xbox Live Arcade House Party, a trailer seemingly released by mistake has revealed. The promotion will also bring Trapdoor's Warp, the CryEngine 3-powered Nexuiz, and Ubisoft's I Am Alive.

Spotted by Joystiq, the trailer has appeared without any fanfare or accompanying announcements, so it seems someone let this slip early.

It's previously been revealed that Nexuiz will cost 800 Microsoft Points ($10) but there's no word on the rest so far. As Microsoft hasn't actually announced the 2012 House Party yet, we can't say when it'll kick off either, but it'll probably be similar to last year's--late February, early March-ish.