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I don't know anything past gen 9, but here is what Game Freak is planning.
June 19th: The Isle of Armor
November 20th: The Crown Tundra
November 2021: Pokemon Time Diamond and Space Pearl (remakes of D/P which has Pokemon following you, the return of megas, the battle frontier, a postgame Giratina and Arceus episode with distortion world, and much much more!)
November 2022: Gen 9 games. Called Pokemon Sunrise and Pokemon Sunset.
The region is based off of these couple of towns in California. The theme for this game is Pokemon in the real world. The game is fully open world with you being able to control the camera at all times. As this is meant to show what it would be like to have Pokemon in the real world, everything will be modern and gyms will be in very accurate places (water gym on the beach, rock gym on top of a mountain, flying gym in an airport etc...).
The story mainly revolves around a Pokemon War once again. There is a tree with a branch that extends far out, and that is sacred to the region, because it survived the war. There is an old man who lives in this sort of old cabin on a lagoon, who mainly sits in his front yard on a rocking chair and hums. He plays a big roll in the story, and he ends up telling you he's the champion, which is a shock.
Legendary Pokemon (don't know the names):
For Sunrise it's a orange Pegasus that's Fairy and Flying.
For Sunset it's green,white,purple, and gold wolf (Zacian and Zamazenta are dogs not wolves) that's Grass and Ice.
On the region, there is a couple of beaches with beach towns, a kind of sketchy but not too sketchy part of town, a town that and forest with a bunch of eucalyptus trees (that's where the sacred tree is), as well as many other locations.
There is planned dlc for this game, but they haven't started working on it.
That's all that has been planned so far.