Don’t care if you believe it or not, you can screencap this. I worked for the french localization team based in Brussels. The games have been finished and they are just waiting for the final localization details. I don’t know Pokémon details as I just worked for the story translation team.
Just as the name says, the two games that are going to be announced are Sinnoh and Johto remakes with the Let’s Go format. Remakes are going to be treated like this from now on.
Sinnoh is going to follow up the Platinum story and will include Dinamaxing as Postgame. The distortion world will bring Dinamaxing as the dimensions will be twisted. Arceus will be available for the first time in the Celestial Stairway episode.
Johto will follow the HG and SS story, but Kanto won’t be a part of the games now. Instead, you will be able to visit the Sinjoh ruins, triggering Dinamaxing all over the region. This is explained in-game as both versions are happening at the same time. Celebi will be available in the Door of Time episode.
Battle Frontier will be available for both games, but as DLC scheduled to launch on April 2021.