Details are scarce, namely its release date, but a previous rumor has suggested that it could arrive in 2018. Now according to a tweet by Pixelpar (via Nintendo Life) who claims to have industry contacts, he has claimed that the game could launch in November 2018 or possibly even in December.
For anyone wondering, Pokémon Switch materials have been undergoing localization since late Feb (possibly earlier).
I've already had confirmation that it's targeting a 2018 release. Educated guess (based on previous Pokémon localization timing) it should be ready for Nov/Dec
— Pixelpar (@pixelpar) April 13, 2018
Note that no release date or timeframe has been given as of yet which means that this information should be taken with a grain of salt for now. Pixelpar also claims that the game has been undergoing localization since earlier this year which means that a launch in 2018 doesn’t seem entirely out of the question.
Needless to say fans shouldn’t get their hopes up just yet but hopefully this proves to be true. In the meantime other rumors about the game include how the version for the Switch could usher in the 8th generation of Pokemon.