So, Avatar plans were leaked in Oct 2012. They showed some Soarin' like ride with four theaters and part of a boat ride. It has now been taken as gospel by some that these are the final plans and what will be built.
I'm just pointing out that in Oct 2012, Avatar was far from finalized and confirmed. We had lots of reports from after that point that the project was close to being killed and that Cameron was ready to walk away. We never got any sort of "official" confirmation about Avatar still proceeding until the Anaheim D23 in August 2013, which had a little Pandora tease. And then some more information from the Tokyo D23 in Oct 2013.
My guess -- and this is personal opinion so grain of salt and all that -- is that Cameron didn't agree with the Oct 2012 plans. He wanted something more/different... groundbreaking. If Disney got him to come to the table and sign off, it's because he got something that he wanted. I think it is extremely likely that the plans evolved between Oct 2012 and whenever they were finalized and green lit (if they've even been finalized). Like many projects, though, I doubt that old plans got completely scrapped -- they probably got adapted into new designs. So, while the plans might still be a "flying on a banshee" simulator and a "boat ride", they might be markedly different than how they were originally conceived. Just like POTC isn't a walk through in a wax museum.
IIRC, there were reports that Imagineering and Lightstorm have a specific building with tight security where they are working on Pandora projects for DAK. It's being closely moitored to avoid leaks. What would be the point if all they are building is a modified Soarin' and a re-skinned IASW?
We'll see once we finally get details of the attractions, but I don't think it makes sense to rely too heavily on blueprints that date to when the land was still very much in limbo and a work in progress.
