Hello! i am working on the localization of the new games but i will share some info. i don't have very much but i plan to share more in the future.

-Sprigatito's final evolution is a majestic tiger that looks like a green luxray. Grass/Fairy
-Fuecoco's final evolution is a big crocodile that looks like a mix of feraligater and salazzle. it usually has its tongue out. Fire/Poision
-Quaxly's final evolution is a big sleek swan. its hair looks like a pirate hat. Water/Psychic
-One of the Gym Leaders is Hau's Father. he uses an Alolan Raichu.
-Ride Pokémon return and work just like they do in Legends Arceus.
-Mallow and Lana are in the game. they look older than they do in the alola games they are visiting the region (just like Sina and Dexio in SM). you battle one of them (version exclusive) and they give you access to one of the ride pokemon.
-There's a regional variant of Flygon, Bug/Dragon. It can be ridden like Braviary in Legends Arceus
-Regional variant of Tsareena that looks like a lemon instead of a mangosteen, Electric/Fighting type.
-Theres a mythical called Aroranoshin. its one of the small ones like mew and celebi. its a Fire/Electric type.
-The game is directed by Shigeru Ohmori and has been in development since before Sword and Shield released
-Theres a regional variant of tauros that has an evolution. Fire type and evolves into Fire/Fighting.
-No new Eeveelution.
-Last info. The box legendaries have themes of fruit. one has grapes and the other oranges.

Thats it for now. more info soon!