The Sinnoh region is coming as Sword & Shield DLC. If you didn't buy SwSh you will have to now lol. It is not a remake but is a re-visit like the return to Kanto in GSC.
>This was always the plan, and the Kalos region is in development and coming after Sinnoh, which is why they wanted to keep the 'dex so cut.
>Other regions may come if the Switch's lifespan warrants but are not yet in development.
>Gen. IX is not coming until the Switch successor arives, but new Pokémon will show up with every region re-visit. No more remakes are planned or in the pipeline, and it's all about region re-visits now.
>Many Sinnoh evolutions of older 'mons will be retconned as Sinnoh regional variants/evolutions and new evolutions of Rhydon, Magmar, and Electabuzz will headline an anniversary announcement soon.
Don't believe me? I'll be proven right by the end of February with a special announcement and you'll know it when these two words make sense: Spinarak Orgy