It has been about ten months since the events of Movie One. Bowser has broken out, and became big again, and Mario, Luigi and Peach must find a lost Yoshi in New York, that can help them fight Bowser’s Nephews and Nieces, the Koopalings, and their cousin and Bowser’s son, Bowser Jr. They must also avoid Mario’s rivals, Wario and Waluigi, who want to be the top.
Mario and his friends must stop Bowser, while avoiding the rivals, and save New York. The film has not been announced yet, but my guess would be Summer 2026.
