The O.P.'s legitamacy aside, none of the long-standing rumors do much for me.
I loved 20k but I don't wanna see it come back as a Nemo ride (nothing against Pixar properties). Beastly Kingdom(e) is gone. Let it go. Many of the icons of that park are in the Lost Continent at IOA and the rest don't seem particularly Disney to me anyway. We should be used to the fact by now that anything not related to Disney films or characters get canibalized into one eventually like Epcot, AK, AE, etc so why do we all think a fantasy park would still get a green light? A villan attraction would be cool, but a park or even and area would be overkill to me.
I'd rather see the less-mentioned Nightmare Before Christmas DHS attraction if the rights could ever be agreed to and the right people were involved in the creation. (Elfman is a must).
As for another park, what the feasability of anything but a high dollar boutique park? AK still doesn't have the crowds really required of a park that size and most guests just don't stay long enough to see 5 parks do they? I mean, I do but I only have a cat and dog and the missus to support.