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My post was deleted. So this is the summary.
> Plot is basically Platinum's
> Dialkia
> Camara control in routes, caves, mountains
> Underground = Wild Area
> Dynamax (No Megas or Zmoves)
> GMax Giratina
> Eternatus
> New GMax Forms (Gen 2 & 4 Starters and other mons, mostly Gen 4 mons)
> Key items for Dialkia has "Mythical Origins"
> League is similar to 5th, 6th and 7th gen's
> Camping is back
> Pokemon Following You is back from the start
> Rotom Bike (No HMs)
> Contests and poffins come back
> Secret Bases and Traps removed
> Let's Go Catching Mechanics in two specific areas
> Graphics are more cartoony like in Let's Go (but no Chibis)
> BF is as easy as Battle Tower
> Episodes for Legendaries and Mythicals
> Two new mythicals
> Names: インフィニティパール & エタニティダイヤモンド
> Release: Fall, 2021; Announcement: 02/28/21
There's more detailed info in other posts.