The song is called "Koi kana" and you can listen to some parts of it here; http://s15.yousendit.com/d.aspx?id=38ED4W5DNIF183VL2MQHQKIJNI
Tetsuro Oda composing both songs...w00t!
According to new information, at the price of 1,365 yen, you'll get Kusumi's 1st single with Kirarin*Revolution book and a DVD (With what? It's yet unknown).