I imagine it'll probably be what Agent H said - Simba, Mirabel, Judy, whatever the name of the main Na'avi in Avatar was, Nemo, and a character from whatever other unfitting IP they plan on shoving in Animal Kingdom (Moana? The goat from Wish?).
At this point, there's a very thin line between being pessimistic and being realistic.
I'd be happy if they were replacing them with attractions about DINOSAURS, which would allow them to keep Dinosaur and the Boneyard, y'know, the parts of Dinoland USA that I actually LIKED.
Instead, they're removing dinosaurs from Animal Kingdom entirely because they don't have any popular dinosaur IPs, and replacing them with two IPs that are about humans, not animals.