Rhythm Heaven Megamix is eShop exclusive

Rhythm Heaven Megamix : The game offers more than 100 rhythm games, 30 of which are new to the series. An additional 70 have been selected from previous games in the series, including the original Game Boy Advance title, which was never released in North America. The game also features a continuous story for the first time in the history of the series. Players view the action on the top screen, and on the bottom screen they will receive feedback on how well they are matching the beat of the music as they play. The game also offers StreetPass features and a multiplayer mode for up to four players. This Nintendo eShop exclusive game launches … right now! Go find it, as well as two new Nintendo 3DS themes and a free demo in Nintendo eShop on Nintendo 3DS, or purchase the game at http://e3.nintendo.com/games/rhythm-heaven-megamix-3ds.

I saw some people questioning whether this title would see a retail release as well. According to the press release, this will be an eShop-only title.