Yes!!! Franchise Havoc and Catacombs!
I have no problem with them reusing the Havoc set or the Catacombs set. The closed-in, trapped feeling worked perfectly for both houses and I don't think they can manage to get that in the soundstages. In fact, Havoc could go totally stripped down...it wasn't the effects (or lack thereof) that made that house. The actors were astonishing and putting them in a bare, black walled maze with little light and no fancy effects would be even more terrifying. Neither you nor they would have any other distractions. Make Havoc HHN's first "Alone" walkthrough, I say.
The only way to improve Catacombs, for me, would be to make it longer and a little darker. Those are two cosmetic changes that don't change the theme or impression of the house. I can't find anything else wrong with that house.
The soundstages need the big productions; Dead Silence, Freddy, Dracula, Frankenstein, Hades and those sort of big ticket offerings. I would like to see two soundstages used for something outrageous and challenging. Perhaps carrying on with the Zombigeddon theme with actual chasing? More of an obstacle course, a la Run, but with zombies. If the zombies 'catch' you, you get 'tagged' somehow...a washable, temporary blood red (or gooey green) stain on your clothes, maybe. Of course, warnings would have to be everywhere, but how much fun would that be?
Bring in the music ideas, too. I've seen names thrown around (I admit to being woefully under-educated in them) but I still like Creature Feature. Their music is quirky, not hardcore, and would appeal to more folks than the growly, speed stuff. I think their stuff would do well in the HHN setting, in return. They would go nicely with a steampunk theme...something else that's been bantered around.
Gosh, what a long wait this is going to be....
Mae