Hi, I'm here again after some days lost finding information about these games. I found this:

-Ten Carat Hill is a dormant volcano that wakes up.

-The Ultra Space is now more big.
New zones: Big Black Core, Unknown Spot, Rainbow Hall, Deep Hole, Ultra Beast Corridor...

-New Alola Guardians: the Waku Pokémon dynasty (parallel to Tapu dynasty)

-We also have new Tapus that I said in previous leaks: Tapu Gong, Tapu Make and Tapu Akua. I said that Tapu Akua was Water/Fairy. Sorry, I had a mistake, is only Fairy type.

-The leaks that said something about Necrozma Sol and Necrozma Luna are fake. There is a new form for Necrozma, called "Dragon Prism Form". Psychic/Dragon.

-Nintendo is waiting for July 1st for reveal the first details about the game.

More details coming soon. Stay tuned.