Mario Kart 8 DLC has been confirmed for Japan. The first real car model for the Mario Kart series. The Merecedes-Benz GLA will be available during the summer and there will also be a special tournament during the fall.
Will update the OP when info for US/Europe hits.
Now I'm hoping for a McLaren P1 DLC. What real world car would you like to end up as DLC?