It's gonna sound petty, but I really wish they'd just release a full demo. It seems like they're milking the demo too much during the period where they are releasing official trailers and information. The demo already feels outdated.
I watched Mike play the other day. All we got was another finger piece, the new area in the room, but I don't remember the ending. Of course the last demo I had seen was the very first one, so I am not sure if it had changed since then.