One thing that I am extremely curious about is the natural aspect of this project. The main point of this expansion is to make you feel immersed in the rain-foresty world of Pandora. Since the entire area has been bulldozed and cleared out, a large component of this construction project at some point will include the addition of a HUGE amount of trees/plants/grasses/bushes/etc. - of both the real and AA varieties. I am still trying to figure out how imagineering is accomplishing this so that it appears lush and fully grown by the time this expansion opens. Maybe it won't and will take the slow passage of time to achieve that type of overgrown forest appearance.
The other thing I wonder is the bioluminescence and reactivity of some of the Pandora flora. I recently watched the movie again, specifically the portions that introduce you to the flora and fauna of Pandora. If WDI really goes for it here, I would imagine that it will take a lot of energy to power this expansion. I mean a large percentage of the foliage illuminates at night, including the ground where people are walking. There are also numerous plants that respond to touch (and I am assuming that WDI will be attempting to ape that activity as well to really work on the immersion factor). This is potentially a very different and difficult overall effect to achieve and I can only imagine the type of wiring/programming/etc. it will take to pull this off. If they do though, as I have stated previously this should pretty much blow every other Orlando park - and not just WDW parks - out of the water in terms of immersion and uniqueness.
Slowly ticking off the days...