Remember that that Pokemon Sword and Shield released less then two months ago. It's waaay too early for them to be revealing new main series games, imo. I don't expect Sinnoh Remakes in the slightest.
Pokemon Home news sounds super likely.
I'm skeptical of the idea of there being DLC, but I'm not ruling out the possibility. GF has been reluctant to jump on the DLC bandwagon in the past but there's no reason why they couldn't change their minds. In the case of DLC though, I expect it to be new areas where you go to find and catch a mythical pokemon, or maybe a legendary from a previous gen.
I don't expect big national dex expansions. I really hope we see it but I feel like that's something they would have announced a lot sooner in an attempt to quell the backlash.
Pokemon Masters has a chance to make an appearance. I don't know much about that game but it's still frequently updating so hey, we might get an update on it.