Volcano Bay looks very cool, but it continues to look spectacularly like a water park, NOT a third theme park. (Though it seems they've maybe backed off on that sales pitch.) The two thing I noticed - the body slides with the "drop" out of the end - my wife and daughter would hate those and never ride. Second thing, the Tapu Tapu looks very large - much larger than a MB. I wonder how many people are going to be annoyed about having to wear those around a water park. (Especially since many people are interested in getting an even tan at a water park.)
I am interested in checking it out someday, just not sure when that will be. I love water parks, but my family (DD and DW) is won't ride most water slides at BB and TL, so I don't see me rushing to spend $250 to go there.
Avatar land from what little I watched looks very cool. I've been thinking about the "ride seat" problem. It always comes down to the bigger the thrill ride, the more restrictive the ride will be. Engineering wise it's hard to design a fast motion device that will work for both a 4' 8" 95 lb kid and a 6'5" 500 lb adult. I imagine they endeavor to make the ride have as wide a range as possible.