Man, now that this is here, my presence in the Mutsuhiko Izumi thread would outright vanish (<90% of her Bemani songs were composed by him and my favorite songs by Izumi are the ones vocaled by her). Plus, I think it's interesting to point out that pretty much all of her songs on GF/DM have a long version with the exceptions of the 2 covers and My Friend and フレンズ (I
really hope I'm wrong about the last two).
Anyway, the most I know is that she actually has an album out already shown here:
Natural Crayon website as part of the group "Natural Crayon. I still haven't heard the actual album, but there are previews of the songs on that site.
Also, here's one of the more useful pages that I've seen, which still isn't much:
Kuni's HP Menu. Take a look around and there's actually at least one clear picture of her. Unfortunately, I don't know much else as I can't read Japanese.
EDIT: And yeah, there are other stuff she did outside of Bemani aside from Natural Crayon. This can be seen in the Wikipedia if you haven't looked through that already.
くにŸ‘み‚†き - Wikipedia