https://www.gamespot.com/articles/mario-kart-hot-wheels-debut-at-san-diego-comic-con/1100-6460559/

Nintendo and Mattel teamed up to create Mario Kart Hot Wheels. The toys debuted at San Diego Comic-Con 2018 and will be available in stores in summer 2019.

There are eight toys planned so far, with no word if more are planned for further down the line. For now, you can look forward to racing down your favorite Hot Wheels track with Mario, Bowser, Peach, Luigi, Toad, Yoshi, Wario, and Rosalina. Hot Wheels is planning on releasing some Mario Kart-inspired tracks for people to race on as well.