Alola Abra will be Fighting Dark.
Nidoqueen will get a mega.
Drasna will make a cameo.
Rare Pokémons can be caught in the Safari
You will catch mikimyu in an abanoned shop.

PokéStops will make a cameo.
Unova region can be explored after league.
Zygarde will get a mega.
Zygarde has 5% and 40% forms.
Iris will make a cameo along with drasna.

Dragon Pokémon now are weak to water.
In the central island there is the league.

Certain Pokémons will get a mega.
At a certain point of the game Hala will
Catch a Talonflame.
Catching Pokémon is more difficult.
And that's all.