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I can see the new games being something like this:
>a bunch a colourful flowers and very minor scenery changes to freshen up the routes
>Ultra Space will get a minor redesign to be more explorable and interesting
>they actually finish the unfinished areas - explorable volcano interior, upper rockpool area + indoor cave, lighthouse interior, hotel and golf course, , Geothermal Power Plant, Lake of the Sunne/Moone surround, Poni Meadow cave
>these new areas will bring pokemon like Slugma, Numel, Corphish, Binacle into the Alola Dex
>post-game legendaries can be found here, like Heatran or Volcanion or Cresselia/Darkrai
>they will add more trials - Kahili on the golf course, Molayne at the Observatory, Mina and Ryuki on Poni Island
>they will tweak the current trials - Kiawe's will be in the volcano, Sophocles will be in the Lighthouse
>the totem pokemon will be different in some cases- Togedemaru for Sophocles, for example.
>there will be a limited additional group of Alolan Forme pokemon - maybe three or four on each version exclusively
>You will get a Mega Ring earlier in the game, and can collect Mega Stones throughout the region from NPCs
>Colress will once again be involved with Team Aether and be interested in fusing Necrozma with Cosmog
>Lillie will steal Cosmog again like in SM, and accidentally end up helping it evolve to achieve Colress' goals
>Team Skull might get a new Admin with Plumeria (and Gladion), and we get more interactions with those Admins
>Battle Tree has a number of random characters added to the roster
>Island Scan has a number of random pokemon added to the roster