If I had my pick for 5 lands:
-Nintendo as was planned (DK/MK/Yoshi) but add the DK Playground, Kirby flat/water area and Bullet Bill train
-Dreamworks (Shrek, HTTYD, Trolls)
-Monsters - because why not? It's their property.
-LoTR
-Wizard of Oz - Something to appeal to the older generation and the colors of the land and story just fit with a theme park if done well
I only expect 2 of those to come to fruition and I'd be shocked if there were 3.
They also need to find a way to put Pokemon somewhere. Whether thats USF or IoA or Park 3- they need to find a spot.
Zelda would be great, but Pokemon is a necessity.