There will indeed be a Nintendo Switch version, but it is still in development and is quite a ways off. This fall, the game will be on PS4 and Steam in North America & Europe. :)— Dragon Quest (@DragonQuest) July 17, 2018
Square-Enix is currently taking questions from fans about Dragon Quest XI for an interview with the dev team. One fan on Twitter took the chance to ask about the Switch version, and Square-Enix offered up the following answer. Not too much of a suprise considering what Square-Enix has been saying so far, but you do have to wonder just how long we'll be waiting.