The thing with Nintendo is it has multiple IPs with it. Making the third park all Nintendo would never happen. Having the kid zone section with the likes of Mario kart, donkey kong, and Mario bros is great. Then the new park can use Pokemon(if able), Zelda, luigis' mansion, metroid, and others. Helps both parks with attendance and still allows the third park to bring in more.
If this park happens we know for sure Fnatastic Beasts or something else Potter is going there. So can probably assume Nintendo additions and potter and I believe Jurassic World will get attractions also. I would love to see something Godzilla done just have no idea what could be seeing the scale of the new version. SpongeBob has a good chance along with Laika and HTTYD. They can attempt LOTR but I doubt it happens and I don't care if it happens either way.