It appears that the group in the commercial is a compilation from three Taiko groups: TAIKOPROJECT, UCLA Kyodo Taiko, & Venice Koshin Taiko. Each provided some of their female members for the shoot that took place in Playa Vista in April. They performed live at the Mitsubishi Dealer's Conference in Las Vegas in June. Check http://www.taikoproject.com/00/index.html and http://www.pbase.com/bryanyamami/mitsubishi_commercial&page=3.
Another site that provides a bit if insight is the Blog Page of Yuri, one of the performers at http://www.xanga.com/guestbook.aspx?user=MissYuri.
I don't know whether they will do anything beyond the commercial. But it appears that many would buy anything they produced.