While there is no word on if Nintendo ever intend to bring the game outside of Japan, like they did with previous releases, the company have recently released their demo of Rhythm Tengoku: The Best Plus (Rhythm Heaven: The Best Plus) on the Japanese Nintendo eShop. This release is simultaneous with the game’s 3DS exclusive release in Japan today.
This demo will allow players to sample some of the games included in this release. In the full release, the game will feature approximately 70 levels from the three previous instalments and a further 30 or so completely new rhythm games.
While I have yet to play this demo for myself, you can read my review of the Wii exclusive Rhythm Heaven Fever / Beat the Beat: Rhythm Paradise HERE.