A friend of mine works at Game Freak. He tells me that D/P is being remade as a Let's Go game (Let's Go Riolu and Buneary), along with G/S (Let's Go Togepi and Marill). He said that Black and White, however, were being remade the standard way. These are just some of the features he said were in them:
>Following Pokemon are in.
>Candies return, but give EVs. AVs are gone.
>Characters from past games appear, including Green (using her LGPE design, but in Gen 8's style) and Red.
>Skippable Cutscenes.
>Game Corner is back, despite not being in the originals. It's located in Nimbasa City. No slots though, a game similar to Voltorb Flip is played instead.
>Hidden Grottos from BW2 are in.
>Dream World is back, but is a minigame inside of the game instead of being online Events are planned to be hosted for certain Pokemon, sort of like Mystery Gift.
>GO catching mechanic returns from Gen 8 and LGPE, however as in Gen 8 and previous pokemon games you still fight the Pokemon in the wild.
>After beating the Elite Four, you can visit Virbank City. Two new areas are on this side of the map: Serene Fields (located where Pokestar Studios is in BW2) and a WIP Virbank Complex.
>Lentimas and Humilau are also visitable. Lillie and Gladion show up in Humilau, and comment on its similarity to Alola. You can fight Gladion and Hau.
>5 new Megas: Mega Seismitoad, Mega Gothitelle, Mega Reuniclus, Mega Eelektross, and Mega Hydregion.
>Kanto, Johto, Hoenn, and Sinnoh Pokemon appear post-game.
>PWT-ish Battle Facility, I don't have many details on it though.
>fully voice acted, just like gen 8.
He also sent me a sample of the music that plays on Route 2:
https://picosong.com/wXHuU/
You're welcome, /vp/.