The guys's new song being used in their latest Suzuki's SOLIO ad is called ULTIMATE WHEELS <3
CM -
http://www.suzuki.co.jp/solio/solio_kat-tun/#/cm
LOL it's epic if not hilarious once more xD
Making of the CM -
http://www.suzuki.co.jp/solio/solio_kat-tun/#/maiking
you can hear a longer preview of ULTIMATE WHEELS in the making

. I think it's safe to say this's going to be their next single after CHANGE UR WORLD ?