First off, chaos now has his character designs released, and Hoshi-sama has been confirmed as his voice (even though it was already obvious from the trailers).
Also, we've got a new Hoshi-sama song! Apparently the name of it is "Tamayura no Shizuku", and it's sung by Hoshi, Inoue Kazuhiko, and Takahiro Sakurai. You can hear it here if you click "enter," then go to Gallery (third link on navagation) and view the trailer. Very pretty song.