Region based off Italy, called Romo

Not big and vast like Zelda as many wanted, but surprisingly much bigger than you'd expect. Some should be happy.

Difficulty rises from Sun and Moon, and EXP share gives less exp to whole party.

Starters are a jaguar cub, a calf, and a platypus

Don't know about the final evolutions, but the water and grass starters become Dark and Poison, and I think I can see where the calf's going

Surprisingly they have much more story involvement if you have them in your party.

New legendaries. One resembles a bird of paradise and the other a gorilla.

They are Flying/Fairy and Rock/Ground

New battle mechanic. Gigabilities. Turns abilities into more powerful versions. Like a superpower

Starter will have their own variations. Blaze will power up fire type moves and will always inflict burn with contact moves. Overgrow boosts grass moves and induces paralysis. Torrent boosts water moves and cause whirlpool as a passive.

Gyms are actually not in this one per se, but another new take, colosseums.

Colosseums are more like tournaments, beat all the competing trainers to challenge the champion of that colosseum.

Each one has a theme and gimmick as well

Rival is not a jerk, but not friendly either. He's rather reclusive and silent . But does have some competitive spirit with you.

Evil team is Team Reverse. Team wants to bring back the tradition of giving up your pokemon to the winner if you lose.

A system similar to the PSS is in the game. Much easier access to other players online.

Pokemon following is also returned.

Customization has more additions, like suits and dresses, even pokemon costumes

Another pokemon amie like feature

Sadly no luck finding out what plans they have for post game.

Ultra wormholes do come back though, but only as a certain time of day.

That's all I got for now, but I say you guys are in for a treat.