I spoke to a CM who walked through the new area and he said there was no drop on the boat ride, so there is little reason there should not be a wheelchair boat.
Also, there is going to be a weigh limit/body size limit for the Flights ride, it is similar to what happened with that ride in the Harry Potter World at Universal. People must fit into the harness/seat, and be able to maintain the balance to straddle a motorcycle-type seat. That basically keeps anyone who uses a wheelchair, many amputees, people with balance problems, and people of size will not be able to ride...
I checked the hearing accessibility accommodations and it lists "handheld captioning" for the ride. I am not entirely certain how that will work on something that is supposed to be a thrill-type ride.
I am hoping that after the land opens things will make a little more sense. I would find it shocking they built a whole new land and made it basically inaccessible, especially since it is a movie about a guy in a wheelchair!