New ground up parks don't really happen anymore, outside of China, Disney, or Universal.
This would be my bet if one did happen.
Schlitterbahn is a cult in Texas. They now own the entire complex. Both parks, golf course, vacation village, hotel, all of it. If you have a resort already, in the fastest growing state in the country, between two of the fastest growing cities in the countries, this would prove to be tempting.
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