Earlier tonight, Nintendo released the 4th wave of the Mario Kart 8 Deluxe Booster Course Pass. This new content also came with a new playable character, Birdo. However, Nintendo did confirm that Birdo would not be the only new addition to the roster in the coming months.
Well, thanks to the release of the DLC tonight, we now know exactly how many characters are planned. The updated roster screen now shows 5 question marks, which means that there will be 5 more characters that Nintendo will be adding to Mario Kart 8 Deluxe in future Booster Course Pack waves. You can see a tweet relaying the news down below.