The Nintendo Switch version of I Am Setsuna is set to recieve a free DLC update in the Temporal Battle Arena. This free DLC is due out soon for everyone that owns the Nintendo Switch version of I Am Setsuna.
The Temporal Battle Arena allows players to upload their party data, as well as download other player's party data and have them do battle in an arena style environment.
Be sure to check out gameplay footage of the Temporal Battle Arena below!
So solid release date for this content yet, but Square Enix as assured us it's coming soon.