I think it is both realistic and welcome if the Monsters are not back.
Things I could see coming:
TLOU Part 2 - Season 2 of the HBO series releases next year, and Neil Druckmann would be eager to come back to the event. The only argument I could see AGAINST this is that Part 2 will be split into multiple seasons.
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Stranger Things 5 - this is basically a given for either 2025 or 2026. If Netflix has to choose between Six Flags and HHN, the choice is obvious.
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Jason - as mentioned earlier, the "Jason Universe" was announced recently. With the rights issues now seemingly much less prevalent, now is as good a time as any to bring Jason Voorhees back to HHN (please)
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Dead by Daylight - still a very popular video game, but the main reason for this is Blumhouse. For those who didn't know, Blumhouse is making a Dead by Daylight movie. No timeline on release, but if it's next year or 2026, I could see it at the event.
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Five Nights at Freddy's - obvious pick. Movie was huge and it would be a massive get for the event. Just a matter of if they want to attempt to get it again or not!
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Terrifier - I hate Terrifier but can't deny the level of popularity it has gotten. And if Aiello is a fan, that gives an even bigger chance.
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Megan 2.0/The Black Phone 2 - both of these release next year, so I could see them doing another Blumhouse mashup with these properties. Black Phone 2 doesn't release until October, but they've obviously had houses prior to release before!
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The Weeknd - he was back in Hollywood this year, so I have to imagine the possibly could exist for him to return to the Orlando event as well.
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Monstruos Part 2 - Hollywood did a second house this year. If Orlando determines their version was popular enough, we could possibly see it in Orlando too.
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Something from Slaughter Sinema 2 - whether it be Mardi Gras Murders, Zyborgs, Heavy Metal 3D, etc.. it's almost a given that we'll get something from this house.
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This is less specific, but I can see them doing the "zone-to-house" treatment again. It worked well with Major Sweets, so that could be a possibility. Whether it's something from 2024 like Torture Faire or Swamp of the Undead, or something from a previous year such as Vanity Ball or Invasion - they may want to give this another shot.