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I have know way of proving any of this without giving away my position, but screencap this for posterity.
>Next games will be called Dynamax Sword and Dynamax Shield
>Set in an alternate timeline of Galar
>Mons that weren't in SWSH are in the new games, but mons that were in SWSH aren't in the regional Pokedex
>However, the end of the games unlock the national dex because the plot involves merging the two timelines
>The new Galar Pokemon are still there, and there are a few new ones
>Dynamaxing is a common practice in this timeline and has allowed society to flourish
>Piers is the "villain" of these versions, views Dynamaxing as unnatural
>Marnie functions as his sidekick and as a sort of rival, realizes Piers is wrong and joins your side towards the end
>Galarian Shinx, electric/fairy typing
>Improved trading/battling system, not quite GTS but has more features and less barebones than the y-comm
>New island area with 3 new routes, presumably a reference to Ireland
This is all I know so far, believe what you will