Was it actually an older plan? I thought it was just a less impressive scaled down version with only interior scenes. I also think it did have drops, but smaller ones ala Pirates or Frozen instead of a big one. Think it was said to be a D ticket instead of Paris' E (I assume it's an E anyway).
It'll look kind of bad if they give Orlando the short end of the stick on a potential Lion King ride with a lesser variant. Especially if it goes in AK.
I don't know what the officially designated expansion pads for Africa are, if it actually has any. I came across an old pre-Pandora article from WDWmagic that seemed to outline a large portion of the areas outside the "berm".
Possible construction sites at Disney's Animal Kingdom
www.wdwmagic.com
At the moment these areas are occupied by backstage buildings, a parking lot including tram storage and retention waterways that would likely need to be relocated if they wanted to use this plot of land. It may also encroach on some of the forest/swampy areas that i'm unsure are suitable for development. The Lion King show building itself is massive, something around 138,000 square feet based off the blueprints. Not even including the surrounding miniland. I've overlayed a rough estimate of the land onto an area marked in the above link. They could conceivably connect it via a walkway from the Lion King Festival show building (would need to pass over or under a service road). I don't have any clue if this placement is feasible though.
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