To be blunt, and I am meaning this nicely.
I think IP's like Hellraiser, Killer Clownz, or House of 1000 Corpses aren't as possible to me. They seem more like fan dreams, and that logistically; it doesn't make really any sense to bring those IP's to the event. For the fans? Maybe, but there are probably reasons to why those and others aren't making it anytime soon.
They are possible. But they aren't going to be the IP's that get people in the gates. They'll be the houses that help round out the line-up.
I've heard good things about Hive from Legacy. So maybe it's the exception in the "unexpected changes" category?
We'll see. I've heard to not rule it out so... We shall see in a few weeks.