This Wednesday, Tracy, Hanenbon, Nanocarp, and Beatnes will be available on Japan's DSi Shop. On July 22, Rec Rec and Lumiloop will be released. Finally, in August, Sun Animalcule, Luminaria, Marine Snow, and Volvoice will be available.
This could be the perfect venue for creator Toshio Iwai to release future musical toys. Could Electroplankton continue this way, with new instruments being released periodically? It's probably not wise to hope for anything that isn't a segment of an existing game, but it's possible!