From the article:
"...why not grab a gourmet meal at one of the park's two highly themed eateries? Or -- better yet -- find a seat inside of Night Kingdom's centrally located main theater. Where you'll then be dazzled by a state-of-the-art stage show which will be produced by Disney Theatrical and feature top Broadway talent."
And by existing areas, I mean, they will obviously not be hauling in an entire new savannah or hippos etc., maybe they would, but I doubt it.
They'd have to have some things accessible inside the existing park if they are going to be using their "two highly themed eateries" which can only mean Boma and Yak & Yeti, in my opinion.
I think a careful survey of the area via arial maps could reveal where they might put the entrance in reference to the existing parking lot and bus stops, where a new theater might go, etc., in connection with the existing Animal Kingdom park.