This piece of news has been out there for days.
Source:
http://www.oricon.co.jp/news/music/45263/
Shiina Ringo wrote a song called "玉手箱" by request of the Kabuki actor Nakamura Kanzaburo (whom she had a talk with in year 2006's Bokura no Ongaku). Nakamura will use the song (or is it a piece of traditional music deliberated for Kabuki?) in his new theater work "三人吉三". There's no plan of releasing it in the form of CDs yet.
Don't know how to read the kanjis.