Nintendo announced Mario Kart Tour for mobile devices, and that was about it. We haven't really seen or heard anything about the game since then. It's still coming, but when will we learn more? Reggie Fils-Aime shed some light on that.
“Depending on the game, E3 could or could not be a place to shed light on mobile activity. In the case of Mario Kart Tour, we made the decision that there's going to be another opportunity to shed more light on that app, especially shedding light when it's closer to its launch, We continue to be on track to launch it in this current fiscal year for Nintendo.”