The thing is, we all kind of feel like we're due for some kind of Mario, so it is something. Mario I guess refers to both 2D and 3D, so that's certainly a curveball, and Donkey Kong, another series we expect to see soon, is in a very odd state. Donkey Kong is a big IP, it historically sells a lot, but it has had a hard time maintaining relevancy, so it's hard to determine if it should be considered unreasonable to expect it for Switch.
There hasn't been a new game in almost 10 years, so it would feel like a revival, but considering the attention his series is getting in the movie, and the fact that he's next in line after Mario for GETTING A THEME PARK, it feels like Nintendo wants him to be up there with the big dogs, but there's yet to be proof where it really counts, the games.
But yeah rumour is pretty telling