According to the latest blog post of Zipoo, a well-known Nintendo whistleblower, a new 3D Mario game is currently under development. This will be the first 3D open world Mario game and is not a sequel to "Super Mario: Odyssey". This game is developed by Nintendo Planning and Production Headquarters and will surprise players. This Mario game will become the first escort work for Switch 2 and is expected to be released next year.
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The previously announced games "Princess Peach: Showtime" and "Mario VS Donkey Kong" both use a highly upgraded version of the 3D Mario engine, which is mainly aimed at the next generation of 3D Mario games.
Mushroom castle modeling comparison, the top is "Princess Peach: Showtime", the bottom is "Super Mario: Odyssey":
In addition, Zipoo also stated that the new Donkey Kong series has been transferred to Switch2, but Zipoo is temporarily unable to know more information.