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New Gold and Silver remake by ILCA is in the works, will be revealed this year. Has been a thing since around the same time Brillant Diamond and Shining Pearl started being made. It will be very similar to BDSP, but will use HeartGold and SoulSilver code instead of Diamond and Pearl code
There doesn't seem to be anything planned for Unova or Gen V as of yet or at least I haven't heard, I wouldn't expect anything before some time. BDSP and the new Johto game are the only two ILCA has been working on for now. I also haven't heard about anything regarding a new Let's Go or Legends inspired game, I wouldn't expect that to happen at all.
I do know about another game however, not technically a Pokémon game but a new Smash Bros game is in the works, set to release on Nintendo's next console. It's still very early on and probably won't be revealed before some time, however I know that Tinkaton will be a playable character in it.
That's all I have for now.
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