Announced back in June in Hobby Japan August 2009 issue, this is a limited item exclusive for Hobby Japan. The pre-order ticket was included in the September issue, and pre-order was over very long time ago (September 10th).
The price is 3,360 Yen (inclusive of tax).
Apart from the color scheme, the content of this Advanced GN-X is exactly the same as the regular unit, also a limited item, but for Tamashii Web Shop instead - already released in September last year.
All images are from Futaba Imageboard.