Regarding the comments about losing HHN maze spaces, I don't believe Uni will chop maze sites without finding replacements...HHN is too big of a moneymaker for them to ruin like that. They could do more soundstage haunts, they could move them to new locations (perhaps even backstage), or they could start to incorporate parts of IoA into the mix (I still expect that to happen).
Regarding this new rumor, WOW, unreal! Can't wait to hear more when the timing is right!