A few weeks back, Nintendo announced that it would be releasing the black Balance Wii Board to Japan. The new color had previously been announced just for release outside of Japan.
Today, Nintendo shared pics of the packaging, but did not share a final release date. The Wii Fit Plus Balance Wii Board (Black) Set will be released some time in the early part of this month, priced ¥9,800.
This is not a limited edition. Nintendo says that it will sell both the white and black sets from now on.