Just to kinda spark this discussion again:
First of all, the chance of Pandora being under a dome is as likely as Universal covering IOA in a tent for HHN. :look:
If it's nowhere that the community expects Pandora to be, where could it possibly go? Well, behind Rainforest is backstage and very close to the backstage hub of DAK, something not very easily moved. There's parade float-housing buildings, service facilities, management facilities, and cast services all back there. Basically any and all buildings necessary to run a theme park.
There's the thought that Planet Watch/Conservation Station can be torn down and replaced with Pandora, but it's such an important part of the park's message (albeit, an unpopular attraction), to be torn down. I doubt Joe Rhode would let his park's (and yes, it is HIS park) message be so easily destroyed by an outside source, something judging by the interview that he doesn't really believe in. Behind that area is all the necessary facilities to house all of the safari animals and other animals (zebras, etc) that aren't on safari or are sick.
Between Dinoland and Asia, yeah there's just about nothing other than backstage roads and "temporary" structures (classroom portables) that are used for park management of those two lands. Again, not an easy move, but it could be done if necessary. There's also a state(?) mandated fire-evac road for Dinoland and Asia attractions that needs to be on the perimeter of the park, and widening the park into that retention pond and surrounding forest wouldn't really add THAT much room. Plus, have any of you ever seen the back of Everest? That's just something else that'd need to be done if the park expanded in that direction.
While converting Camp Minnie-Mickey seems like the most logical solution, there's a reason or two why that'd be complicated also. Disney wouldn't be so keen on giving up their top-rated park show (Festival of the Lion King) on a whim, so it'd have to be moved, and thus, a new theater built in Africa (Joe Rhode would crap his pants if it went anywhere else). Now, there are character trails in between Asia and Africa that don't really need to be there, and a theater similar to the size of Lion King's now could easily fit (just by eyeballing it off Google Earth) in that space. Problem solved, right? Wrong. While Joe Rhode might not mind too much that the least-themed area of the park would be leaving for Pandora, the big-wigs still want the big characters (Mickey, Minnie, Goofy, etc) to have their own locations in the park that constantly have a character in them, and they'd also be losing the character trail (used by Jungle Book) between Africa and Asia. To draw up more foot-traffic, the characters could get a building in Planet Watch, but it's unlikely. I don't see anywhere else that all of the characters could stay in the park and logically have a place to their own.
Just another tidbit on that: Goofy and Pluto also make appearances in Dinoland between Primeval Whirl and The Boneyard, but they are not there all day.
So where else could Pandora go, and what could we see there? Just to throw a few crazy ideas out there:
1. Not get rid of Planet Watch, but fill in the area in between Planet Watch and Asia. This uses up expansion room, but it has some major faults, too. It eliminates the wheel & spokes design that theme parks (other than USF and DHS) follow nowadays, and cuts off access to Pandora unless traveling through Africa first (major crowd control problem in peak seasons). However, it's not out of the question because it's got a fairly large plot for expansion AND it will not interrupt backstage operations both during construction and after completion.
What could fit there?
a) Definitely a dark ride the size of Dinosaur, a major coaster (flyer, perhaps?), and one or two smaller attractions as well as room for restaurants, gift shops, and backstage operations. It's a fairly large plot.
2. There's a lot directly behind Rainforest Cafe that's only used now for backstage parking, to my knowledge (not typical cast members, but others). There's the possibility that this as well as Camp Minnie-Mickey could be used for the expansion, making Pandora roughly the size of the Safari area. There are problems with eliminated CMM, as stated earlier, but the lot itself poses some problems. It's not as big as the lot between Asia and Planet Watch, and to get to it, they'd either NEED to eliminate CMM, or eliminate the old Pocahontas stage and use it as the entrance point for Pandora. They cannot expand all the way to Rainforest, however, because there's a road there that must remain for shipping to the restaurant.
What could fit there?
a) The possibility of a large, outdoor coaster fades here because of the definite view of backstage operations. However, room for a large dark ride still exists as well as room for a quick-service restaurant, gift shop, and one or two smaller rides. Backstage operations for this plot could be located behind where Festival of the Lion King currently resides, if CMM is kept.
3. Transformation of a land. There, I said it, and it hurts. But in all seriousness, Dinoland could possibly be transformed into Pandora if the big-wigs decide that's what they want. It's the least overgrown land in the park, so not nearly as much tree removal, plus existing structures (Restaurantasaurus) could be re-tooled and repackaged very easily. Obviously there's complications here, too. The vehicles alone on Dinosaur cost Disney a fortune (if you recall, Dinosaur was the staple attraction here for a while), and would cost anyone signing off on that deal to lose some sleep over a figure that staggering. That also opens the possibility for a re-theming of the attraction itself, but being a happy cast member there, I don't want to really think about it. There's also the problem of park crowd flow with this idea: as most of the popular attractions (Everest, Rapids, Pandora) would all be on one side of the park.
What could fit there?
a) Just about anything. Dinosaur can be reborn as a new dark ride to fit Pandora, a decent sized theme coaster could be built, and there's also room for a small ride. Existing infrastructure allows for the quick service restaurant to remain as well as backstage operations.
Just my $.02. I'll also be posting this on my tumblr.
EDIT: My most logical conclusion is that it replaces Camp Minnie-Mickey, a new theater for Lion King is built between Africa and Asia (expanding Africa), and the Jungle Book characters switch off with Pooh characters at the Oasis character spot. What attractions and experiences we see there are there for us to wonder about until more information is released.