Nintendo uploaded a new Japanese introduction video for Rhythm Heaven: The Best+ and a couple of commercials as well.
The game is a collection of over 100 rhythm games, with 70 from throughout the series and 30 totally new mini-games.
Like the announcer for the introduction video says, check it out:
https://youtu.be/OJ5Kd0cV014
https://youtu.be/OgcwXFXQrDs
Rhythm Heaven: The Best+ is set for release in Japan on June 11th.