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There are 17 new mega evolutions. Six of them will be revealed in the September issue of Corocoro (Greninja, Hydreigon, Weavile, Slowking, Bellossom, & Golurk) whilst
2 of them will be revealed at this year's World's ceremony (Mega Lanturn, exclusive to Moon, and Mega Sunflora, exclusive to Sun).
No Kalos post game, and no new eeveelutions.
Pokemon Kanaka is a feature that allows you to traverse through a particular island quicker using a Tauros, Arcanine, Scolipede, Stoutland, Rhyhorn, Donphan, and Gogoat.
Several Pokemon have surfing models, including Sharpedo + Wailord.
Soaring makes a return but is limited to only both Lati's + Rayquaza.