Mario Kart 8 Switch DLC with Birdo, Yoshi's Island gets a release date - Polygon

Booster Course Pass wave 4 for Mario Kart 8 Deluxe will be released on Nintendo Switch on March 9, Nintendo announced. The DLC for MK8 Deluxe includes a new course, Yoshi’s Island, and new playable character Birdo.

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Mario Kart 8 Deluxe's fourth wave of DLC revealed: Yoshi's Island and Birdo is back - Dexerto

Mario Kart 8 Switch DLC with Birdo, Yoshi's Island gets a release date - Polygon