Nintendo announced a new game by the Odyssey team?
Not yet, but EAD Tokyo isn't twiddling their thumbs. It's not overly optimistic that they can get a game done in three years.
Super Mario Galaxy (2007), Super Mario Galaxy 2 (mid-2010), Super Mario 3D Land (2011), Super Mario 3D World (2013), Captain Toad: Treasure Tracker (2014), Super Mario Odyssey (2017).
If they are working on a straight-up sequel to Odyssey, it should be done in three years anyway.