Wasn't there some talk of a Creepshow scare zone a while back that suddenly went quiet?
Also, if I had to guess an IP that might not make the cut, could it possibly be Rob Zombie? I mean, sure he has worked with Universal before, but he basically took all his IPs and made his own haunt event for a few years. That is not to say that he might not have changed course, but it's something that has always nagged me when thinking about the Ho1C house.