I don't know if ThemeparX is the most trustworthy source for rumors like that, besides photo updates of constructions.
I did see that Jim Shull liked this tweet...but once again, I don't know if it means anything. He might know something, he might not.
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There are still many years until 2028, many things could change. They might WANT to make something original for the main park for 2028, but GOD please don't let it be a Villains ride for Discoveryland
. All these recent pitches have me trembling, it all seems a misplaced, rushed mess that doesn't fit the lands or any cohesive theme whatsoever.