Looking through the site, you can find two things, actually.
It seems like the theme song will be done by Gackt (!): Redemption. Another song, Longing, was mentioned, but I couldn't read its role, if any (probably just a B-Side to the Redemption single).
If you click on "Project G" and scroll down, you'll see a picture of Gackt in some FFVII-esque clothing. I'm not sure if this indicates that he is to be a character model, or just a gimmick to promote his music, but it's still cool. Anyone who can read Japanese might be of help here.