This is very early. But why not... 4th Dry Gate speculation.
Universal's Kingdom of Legends Theme Park (I suck at naming things)
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This assumes the cancellation of Six Flags' DC licensing agreement and that LOTR is being left off as the anchor for a 4th dry gate.
Mythica
The park's entrance land, mostly indoors and in perpetual twilight. Leans into Ancient Greek mythology (more than Epic Universe) and far more obvious. Inside you will find your typical gift shops, guest services and Starbucks. Once outside, you are welcomed by a large mountain landscape emulating Santorini. A table service restaurant is located at the bottom, along with a (gasp!) original dark ride. This would be Universal's Pirates of the Caribbean.
Could also make this a newer version of The Lost Continent. Heck, if Mythos is gone at IOA... that could be the name of the table service restaurant.
DC Universe
Built at a similar scale to Ministry of Magic, split into two locales - Metropolis and Gotham City. A Superman dark ride (similar to Spider-Man) is hosted here. Batman gets a dark ride in Gotham City with an inverted Kuka-arm attraction. The Joker gets a Mack Extreme Spinner coaster with multiple launches - this park's Stardust Racers. The land is explorable and detailed just as Ministry is.
Middle Earth
Similar to DC Universe, split into two different sections - Hobbiton & Rivendell. Both are beautiful, but Rivendell will rival Disney's Pandora in natural beauty. Hobbiton is home to a Na'vi River-esque dark ride, while Rivendell is home to a major E-ticket dark ride.
Kung Fu Panda - Land of Awesomeness
A carbon copy of Beijing's land.
Bikini Bottom - Home of SpongeBob Squarepants
SpongeBob finally gets a proper theme park land and dark ride. Also home to a Krusty Krab.
This is a very ambitious/wild Blue Sky. If Wicked ends up taking the large expansion pad at Epic Universe, this leaves LOTR as the headliner for a 4th gate.