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DLC: I don't know much, but there will be more Galarian forms and Gmax forms that you won't see before release.
DP remakes: As most people guessed, DP remakes are next year. The main feature is Dmax and Gmax, with lot's of Pokemon from Sinnoh getting them. Will have a postgame Giratina and Arceus episode of course, and the main features such as the underground, contests, and the great marsh will be back. The battle tower will be in the game, and a dlc at the beginning of 2022 will add some things such as the full battle frontier.
2022: GF is taking the Gen 4 route, and waiting 4 years till gen 9. This years games are Let's Go Rockruff, and Let's Go Stufful. They are Let's Go games in Alola. The games are structured like USUM instead of SM. Z moves will be the feature of course, and your starter has secret techniques, and can't evolve. Has as big of a postgame as USUM, with all of it's features returning. Held items and abilities still left out.
2023: Gen 9 games called Fang and Hoof. Legendaries are a Steel/Grass wolf, and a Fairy/Flying horse. Region based on California. Fully open world and you can always control the camera. Biggest area is a redwood forest, with a big long river.