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Honestly, I wouldn't be surprised if this was related to the potential Tuesday announcement. Gameboy or N64 games coming to NSO? Neat, but could they announce this at a later date instead? That or it could be Xenoblade news as I said before...
Us StarTropics fans never seem to catch a break, even in the eve for the big 30th anniversary day.
Actually we're getting Xenobladed again anyways because of Sakurai's pic of the day most likely...
EDIT: OK so apparently the NSO update was because theres a new FW update for the Switch that lets you access it from the Home menu. I don't know what the announcement could be anymore...