Shortly ago, a new trailer was revealed for Pokémon Let's Go, Pikachu! and Pokémon Let's Go, Eevee! Showcasing a bit more about the games.
Most of the news revealed in this trailer was the appearances of Brock and Misty (and their gyms) as they appear in this side series, along with the appearance of the new rival and an exceptionally minor gender difference for Eevee (a slightly rounder line separating the two fur colours on its tail on females than the jagged fuzz we are familiar with). Certain things were confirmed - such as character and partner customization and the fact that hat!Pikachu/Eevee are not going to evolve. It has also been confirmed that Let's Go, Pikachu! seems to have the Version Exclusive distribution of Red (with at least Oddish, Sandshrew and Growlithe being exclusive to it) while Let's Go, Eevee! seems to have the Version Exclusive distribution of Blue (with at least Bellsprout, Vulpix and Meowth being exclusive to that).
Also following Pokémon sometimes find items in the wild, and online trading is a thing (not just local Switch-to-Switch shenanigans). That's something too.
And lastly, we also got a rather nifty looking map of Kanto as it appears in this game, complete with what might possibly be locations for where you can find various Pokémon, when the games hit the Switch on November 16th of this year.
Mind you, it appears that in their rush to make the region look shinier and put wind turbines on it, they've forgotten that bridge there is supposed to open to let ships out and absolutely blocked off Vermilion Bay, whoops. Lookit them legendary birbs and gene monsters, though!