Level-5 has announced a Japanese release date for Yo-kai Watch 4. The June date comes alongside a new trailer and a relaunch for the game's official website.
Importing Yo-Kai Watch 4: An RPG Journey for the Functionally Illiterate
Yo-kai Watch 4 Gets GeGeGe no Kitaro Crossover, Additional Details - RPGamer
Japan: Yo-kai Watch 4 Version 1.3.0 Update Will Include New Characters And More Yo-kai's – NintendoSoup
Level-5 Provides Additional Yo-kai Watch 4 Details - RPGamer
Yo-kai Watch 4, Yo-kai Watch Wiki
Yo-kai Watch 4 - Japanese Gameplay Trailer
Yo-kai Watch 4 Releasing in Japan in June; New Trailer, Details Released - RPGamer
Yo-kai Watch 4++ Releasing in Japan in December - RPGamer
Yo-kai Watch Academy Y Gets New Trailer - RPGamer