I heard an unlikely rumour that the Mario Odyssey team are working on a 3D Donkey Kong game.
Known Nintendo insider Zippo recently published a blog update, in which they claimed that a new Donkey Kong game is being developed by the Super Mario Odyssey team at Nintendo EPD.
I think I would actually prefer that to another 3D Mario.
Meanwhile, YouTuber LonelyGoomba also recently published a tweet, saying that a new 3D Donkey Kong game is being developed by the Mario Odyssey team.