For original content, I would love to see a Japanese evil spirits house come to the event. That and a Vikings house would be awesome. Those are two concepts I really want to see played out.
As for IPs, here's a list of IPs I really want to see represented at HHN. Once they're all done, I can die a happy man.
-Hellraiser (Why hasn't this been done yet!? I mean, I know why, but it's still weird after all of these years it's still not be translated into a house)
-Scream (Yeah, I know about the whole mess from 25)
-Thirteen Ghosts (Meh movie but would make a DOPE house)
-The Thing (Original)
-The Fog (Original)
-Evil Dead (Original)
-Dead Alive
-Tremors
-The Lost Boys
-It
-Conjuring (I know will probably never happen at this point but a man can dream)
-NoES 3: Dream Warriors
-Troll 2 (No, I'm serious. I think it'd make a really fun house. If Hollywood can do This is the End, why not this?)
-The Grudge
-Jaws (It can be done. I wrote a treatment for a house out of boredom many moons ago, but it's long buried).
-Phantasm
-Arkham Asylum (This would do gangbusters)
-Twin Peaks (Gotta give David Lynch some love here)