Harvest Moon: Magical Melody was released on the GameCube in 2006 in the US. Rising Star Games, Marvelous's European branch, then ported it to the Wii with new motion controls, releasing that version in March of this year. This makes sense for Europe, since the Wii was out by the time the GameCube version would have been released.
According to a Siliconera interview with Natsume president Yasuhiro Maekawa, the company is considering an American release of that ported Magical Melody. "If we were to release the Wii version of Magical Melody", Maekawa said, "we would most likely be looking at a limited release aimed at our hardcore and loyal fans. We have had quite a few requests to release this game and are looking into it." Limited-edition releases have the power both to tempt fence-sitters and to save money for publishers, so this approach is a smart one.
The rest of the interview discusses the history of the series and of Natsume's involvement, and is an excellent read for anyone with an interest in fake farming.