DH used to travel to the area for work and many things are domed or mostly indoors. There are even places with air conditioned sidewalks! With temps ranging from 115-125 in the summer, it has to be. And maybe Disney will learn some tricks they can apply in Florida? One can hope!
The entire island is only 9 square miles. Even with the option to dredge and create more land, it's likely this park will have a small footprint and entirely or mostly enclosed and climate controlled. He was there when Ferrari World opened and said it was basically two rollercoasters where portions of the tracks go outside, with a covered, air conditioned shopping and digital arcade in between.