You can use the #PokeBallPlus as a Joy-Con in #PokemonLetsGo! Good things may happen if you place one of your favorite Pokémon into the device and walk around with it in the real world. It will be able to connect to Pokémon GO as well! pic.twitter.com/I18Y55odpp
— Pokémon (@Pokemon) May 30, 2018
So I guess we'll hear more in the future, but this reminds me of the pokepal thing.