They stated somewhere that they changed it to Go Away and It hurts like they wanted originally debut with in Japan. So I guess they already have new japanese material and we get some afterwards.
2NE1 on Junon, Choa, and Exile Magazine:
http://www.lp2ne1.com/2011/09/28/pho...xile-magazine/
Live in Japan trailer:
http://www.lp2ne1.com/2011/10/01/2ne...japan-teasers/