I'm hoping that Nintendo doesn't go into USF. I've always seen USF as mostly stories set in real places, New York, London, San Francisco etc. IOA is set in fantasy locations like Hogsmeade, JP, Seuess etc.
If I could rearrange the parks, I'd continue the trend with USF being real locations which requires Shrek and Despicable Me to go. IOA would be fake locations but real people so Seuss and Toon Lagoon have to go. IOA would allow for things like Star Trek and LOTR to go in there.
The new park would be completely fantasy from computer games and animation. Shrek and Despicable Me find their new home there.