I think logistically, it'll probably be the big announcement as part of the Hollywood dump. Unless Return To The Blumhouse has anything surprising to it; and if the DreamWorks Theater experience is a surprise external IP (I keep thinking on Chainsaw Man, and the fact that they have HHN merch tied to it ready to go).
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Also think there's a chance we get both Wyatt Sicks + FNAF announced tomorrow, but they announce both at separate points of the day (and don't drop merchandise for either and update the site until Friday morning).