Here's what I think we'll get for HHN30, obvz so much is in flux that I don't know what's final.
10 Houses. 7 "originals" (aka we don't answer to anyone) and 3 IPs (aka we have to answer to someone). IPs: Candyman, Conjuring, and another horror IP that we'd go "of course!" once announced. Originals: scarecrow (duh), anniversary house of some sort, lots of new concepts too looking forward to the next 30 years.
3 shows. New lagoon show, my guess it'll be a mashup of music and horror more than an IP showcase. AoV, of course. Third... I mean... hmmm.... I think we'll get Bill & Ted for the anniversary year*.
Scare zones, same locations as this year. I think we'll get a return of the Vamp 'x5 formula (Vamp 75 during valentines day?) in Hollywood, a returning IP zone (not Purge), a new IP zone, and the Avenue of the Stars zone will be a HHN30 history zone (old zones, characters, etc).
Wild guess: HHNXXX with Jack v Chance v Eddie and guests have a way to pick "sides", sorta like a combo of Pokemon Go's Teams and the trivia game from this year.