According to Fils-Aime, “Right now, as we go into our second holiday, my focus is making sure the current grey and neon Switch continue to have momentum in the market place. You saw systems, whether it’s our own or competitive home console systems, utilize that tactic a bit later in the life cycle. So right now, the current execution of Nintendo Switch with the Joy-Con and all of the capabilities, that’s our focus right now.”
Based on this, it sounds like Nintendo’s focus is on the current hardware of the Switch, as opposed to looking into the future and working on next-gen hardware. At the same time Fils-Aime does not outright deny that there could be a second-gen Switch in the works. After all we’ve seen Sony and Microsoft release hardware revisions of the PS4 and Xbox One, so it wouldn’t be a stretch to think that Nintendo could do the same, but until we hear something more concrete and official, don’t get your hopes up just yet.