I could not find much information, but here is what I have learned so far.
A Tangled World.
![Image](https://i.imgur.com/tBcNypA.png)
It appears that 4 team members are available instead of the three from the previous versions, based on this screen.
This suggests there is some kind of summon mechanic:
![Image](https://i.imgur.com/bi8wogr.png)
In this case, Ariel in Tangled world.
I've also seen gameplay videos of a Monsters Inc World and a Toy Story world.
I also found this concept art:
![Image](https://i.imgur.com/SNQbL5i.png)
Which could suggest that a Big Hero 6 world is going to be included.
This is the one I am looking forward to most of all.
I wonder if the world will incorporate airborne combat, as Baymax has flight capability.
And it's interesting to see the Heartless use advanced technology for the first time with their Heartless Baymax.