Paris desperately needs a flying theatre, and that is an excellent point on languages. Not a huge avatar fan but you have sold it to me better than anyone else so far.
My main concern is the aesthetics of having it on a lake next to Arandelle, it feels like something that needs to be walked towards on a narrow path, in a corner of a park, and then opens out. Like Pandora in florida or GE in cali, you wouldn't know those lands are there until you get to them, when you are there you are immersed (and you would forget the rest of the park). In epcot pavilions, you don't forget the other pavilions- you can see all of them across the lake.
While Im here Paris also needs some more family coasters. We go next month and BTM is down for a refurb, there is nothing under 1.1m at all. Even at that height there is just crush which is always a 1hr+ queue, and then it is 1.2m+. That's pretty weak.