Level-5 announced in the latest issue of CoroCoro Comic that the Japan-exclusive action spin-off title, Yo-kai Watch Busters, is getting a sequel, Yo-kai Watch 2, this winter in Japan. [Thanks, Ryokutya2089.]
Other than the release window of Winter 2017 in Japan, no further information was shared, including its platform(s).
Yo-kai Watch Busters first released in Japan with the Red Cat Troupe and White Dog Unit versions back in July 2015 for Nintendo 3DS. It then got an updated version called the Moon Rabbit Team as a free DLC expansion to the two versions in December 2015.