Full credit to Blysthon on the Discord for maybe piecing this together already:
Pinhead mentioned that we were also getting an international scare zone (not unlike Dark Zodiac last year), and Blysthon almost instantly pointed this out:
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A Day of the Dead scare zone from Singapore in 2016. And what's more?:
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Lady Death, the pseudo-Icon for that year who had a show for opening scaremony. Perhaps this is what the female casting call was for?