Here we go, we're finally getting some concrete details on Dragon Quest XI on Switch! Square-Enix has revealed that the game will be called Dragon Quest XI: Echoes of an Elusive Age S, with the 'S' standing for "Switch," "Special," "Shaberu" (Speaking) and Seiyuu (Voice Actor)." Unfortunately, that's the only tidbit we got, as well as the reiteration that development on this version will take quite some time.
QUELLE und TEXT: https://gonintendo.com/stories/318886-dragon-quest-xi-on-switch-officially-titled-dragon-quest-xi-echo

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