The Nintendo Direct rumors are flying fast and furious, but it's nice to have something that's actually 100% verifiable in all the craziness. That's exactly what we have with Nintendo's latest trademark.
We can see that Nintendo has applied for a trademark of the term 'Mario Sports' in both Europe and Australia. The trademark was filed May 14th, 2020, but the listing doesn't mention platforms or any details behind the name. I think it's obvious what kind of experience this will be, but hopefully we see it soon!