Unless a 2 park layout is used, I think the soundstages will be completely IPs:
SS21: The Conjuring (megahouse; I can't see them reusing Hive's layout)
SS22: It
SS24A: Nightmare on Elm Street
SS24B: Stranger Things
Tent 1: Original
Tent 2: Halloween
MIB Tent: American Horror Story: Cult
Parade/Shrek/Mummy (depends what's still standing): Originals
Honestly, I think the opposite for Conjuring, purely due to that it may be easier for Universal in general, and wouldn't require as much R&D for an IP that was originally planned back in 27.