Given all that was saying with regard to merging a mobile homage by DeNA with eStore options of Wii U, 3DS, New 3DS and all future machines, it is possible they are working on a mild cloud system called Nintendo NX.
Sort of what is used by Steam to keep records of what is owned, bought (online and not physical) and what is used and even save back ups or general back ups.
Just a theory I may ask about.