Oh boy, oh boy, oh boy! Friday the 13th/Evil Dead meets the Resident Evil films and fuck knows what else!?
I'm always way too excited when these meta/self-aware horror films comes out, these are the masterpieces of horror (or as close as your gonna get) for this generation.

Scream 4, Behind The Mask: The Rise of Leslie Vernon (heavily, heavily recommended), the ones that invite the audience in on the old cliches and turn them inside out and all that good stuff.

Plus, Joss Whedon is involved. So, I'm sold.

I've heard amazing things, mainly that you shouldn't hear or read anything on it and just go see it for full effect. If I can get enough cash, I might go see it.

Trailer spoils the twist. Wishing I didn't see it now

Kind of like From Dusk Till Dawn, which plays out like a typical Tarrintino crime flick then vampires show up in the middle of the movie.

Well of course it shows the twist, you won't attract people with a trailer that just comes off as every other cabin in the woods horror film, especially when this twist is the main selling point. Plus I'm certain there will be so many more aces still up this film's sleeve anyway that they can afford to give away this much.