Since there's been a vague suggestion floating around that they're only looking for playset properties that they can make at least five figures for, I think a good Disney candidate for inclusion would be... the Princess and the Frog!
Tiana and Naveen would come with the playset, with Charlotte La Bouff, Louis and Dr. Facilier available separately. The plot would revolve around Dr. Facilier having somehow made a deal on the other side to allow him to return and get his revenge. Enemies would include shadows, various voodoo monsters (such as the living voodoo dolls you see in the movie), and even possessed people.