I adore 100 Acre Wood, Winnie the Pooh was a part of my childhood and hearing the theme song always makes me feel at peace. It's a lovely break from the combat in the other worlds. I hope it continues to feature in future KH games.Depends on how you see it, personally I think Toy Box and Arendelle are going to be the only Disney worlds from KH3 to return to KH4 with the latter adapting the events of Frozen II and the former adapting elements from the 3rd or 4th Toy Story movie with a brand new story. For 100 Acre Wood, well say what you want but personally the world does feel like a relaxation world from the Heartless fighting plus I enjoy Pooh and his Friends.
Finally while not world related but Disney today has pushed back Pixar's Soul to November 20 taking Raya and the Last Dragon's spot, now Raya is set to come out in March of 2021.
It's once again going to be iteresting on how Nomura and his team will choose which films they want as worlds for the next KH games they are developing.