http://www.ign.com/articles/2018/03/28/dragon-quest-11-ps4-and-pc-release-date-announced-switch-coming-much-later-no-3ds-version
As for the Switch version, things are slightly less clear. "We are also developing the Switch version for Europe and North America," reads Square Enix's statement, "
スクウェア・エニックスの声明によると、「欧州と北米向けのスイッチ版も開発中だ」と述べている。