I did shoot some of it. We used Canon 5DMkII as primary camera, plus 7D and Nikon D7000. They all handle low light surprisingly well with fast lenses... but we had a full grip truck with a lot of lighting choices to help when it was just too dark. The coffin shots, party scene, forest at night, campfire, etc. all have lighting to assist the shots.
As far as releasing it, it's in the process of being sold as we speak. I'm told things are looking good on that front, but I'm just the editor at this point, thankfully!