Last year, Nintendo announced two new Mobile games, Dr. Mario World and Mario Kart Tour. In May, select Android users were able to participate in a closed-beta for Mario Kart Tour. This summer, Dr. Mario World released on both iOS and Android.
It has just been confirmed via social media that Mario Kart Tour will release on September 25. It will release on iOS and Android still. For more information, be sure to visit the Mario Kart Tour official website here.