Ending I saw:
Katie, possessed, wakes up and leaves the bedroom. She screams, waking Micah up. He leaves too. A struggle can be heard, then silence. Suddenly, Micah's body is thrown violently into the camera. Katie appears in the doorway, covered in blood. She kneels by Micah's corpe and snarls at the camera before attacking it.
The ending I read about:
Katie wakes up and leaves the bedroom. She screams, Micah wakes up and follows her. A struggle is heard, and more screaming. Katie, in a state of shock and covered in blood, wanders into the bedroom with a knife in her hand. She closes and locks the door, then kneels in front of the camera and slits her own throat.
I don't like crap like that, so I'm glad I didn't watch it.