well lets keep in mind Jim Cameron said this in april as well.....
"Well, Disney are doing a first-rate job designing it. It's going to be completely spectacular. It will be like being on Pandora. You will see real floating mountains. It's going to be a very magical experience just to be there and walk around. And the two rides will be absolute state of the art. But I don't how much they want to say about what those rides specifically will be, so I probably shouldn't say anymore than that. But from what I've seen so far, it will be amazing. I will be sad it's in Florida, because I won't be able to go a lot to it."
who knows whats going on but all things are fluid in theme parks
edit:
just read on a different board that Jon Landau said on May 16th the floating mountains would be 143' tall and specifically mentioned the boat ride.... hey
@danlb_2000 how tall did you predict/guess the mountains would be?