I know its from 4chan, but I thought It'll be something interesting. Plus, I almost has the same information Pokébeach's source has.
Hello, I got some info from a guy that I know which is a marketing supervisor for video games; but I actually CAN'T confirm if those are legit, however i have contact with him for some years, so i believe him. So do whatever you want with them: enjoy it (or not).
(pic not-really related)
-A new pokemon named "Elvany" which is Flying/Fairy will be revealed soon.
-A place named "Tame Park" allows you to deposit pokemons for one day (3 pokemons per day) and trade "PokeTokens" to raise their EVs.
-Dunsparce, Stantler, Mawile and Sableye will get evolutions.
-New characters named "Tofune" and "Mika": They are two boys one with long black hair and one with spikes and a shirt with purple stripes. They are mysterious and challenge the hero many times during the game. They have something to do with the Plot.
-Pangoro seems to exist, and my friend says it has a punk hairstyle and green fur "gloves". It has a new ability named "Vandal Heart" which allows him to have a chance to stole items during battles.
-Skrelp evolves into Weedra which is poison/water and learn the moves Belch and Signal Beam. Clauncher evolves Twice. His final evolution, Slingray is Water/Electric and learns "Blister Blast" a water type move which is also super effective against flying.
-Finally, Kale is the Second gym leader: it has blond hair and has an androgyne style. It has Fairy types pokemon and has the "Elvany" thing in his team.