Some scope is provided when one looks at the new Great Wolf in Colorado Springs that gas a 50,000 square ft indoor park and the new Camelback Lodge Aquatopia in the Poconos that is 125,000 Sq ft, then Kalahari answered that by expanding to 225,000. Wilderness at the Smokies is 60,000 for it's indoor section but it has the outdoor area as well.
But 100,000 can include some serious fun including
Water coasters ,flow riders , smaller wave pool, and funnel , Wave, bowl, racer and drop tube type slides.
It will be interesting to see the actual plans.
I will say that 350 ish rooms seem small for a park that size so they are surEly opening it to the public and not just for lodge stays so that is direct competition for HFE.