Hm...the song is...interesting. I really didn't like it the first time around, but by the second and third time I was sorta in love with it. XD I dunno. It'll be interesting to hear in full, that's for sure. And I hate to make the connection again (BTW, that was me making the picture connection before XD), but it reminds me a bit of Ai Otsuka's 360 song, which I adore like no other.
On a different note though, the CM itself if pure genius. I swear that this is the ONLY commercial with a celebrity that has EVER made me REALLY REALLY want to buy the hair product.

If I was in Japan, I would go out and buy it IMMEDIATELY.