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Hi. Game freak outsourced some of their 3D modeling to my company. I mainly worked on the post game. This is what I know:
-The Fame Checker and VS seeker return
-The Sevii Islands return and have been expanded on. Memorial pillar has become a full grave yard and the trainer tower has become a battle maison.
-All alola forms are of G1 Pokémon
-The SS Anne and Seagallop ferry return, both take you to the Sevii Islands. The SS Anne may be visited once however.
-There are 2 islands in Alola that are not on the official map. One is similar to the Sinnoh Battlezone and the other is for a full battle frontier. Development of the frontier hasn't started yet and it may not see release.
I am able to answer certain questions on this.