https://www.gamespot.com/articles/dragon-quest-11-release-date-and-pre-order-guide-f/1100-6459695/

Dragon Quest 11: Echoes of an Elusive Age saw a new trailer during Square Enix's E3 2018 press conference, showing us more of the title's premise and characters. This standalone story will follow an unnamed hero and his friends as he embarks on a new journey to save the world as a Luminary. It will launch on September 4 on PS4 and PC.

From the new trailer, we know that the hero will begin in city of Heliodor. The hero is then sent to jail by King Carnelian, who seems to have a grudge against the luminaries. We also got a good taste of what's to come with the the localized version of the title on PS4 and PC. The Switch version is expected to launch in the West eventually, but the 3DS version will remain a Japanese exclusive.