Rise of Nightmares is a Kinect-only survival horror game coming out from Sega, so obviously you'll want to see the trailer. It's a bit of an outlier, in that it will be (I believe) the first game in the horror genre that depends on the Kinect.
As you'd expect, the trailer below is not for the faint of heart. It's full of blood, ghouls, evil and even a frightening clown! Boo! Scary!