Sony has just announced a partnership with Toppan Printing, KDDI, and The Asahi Shimbun Company to start a joint venture focusing on the eBook distribution business. This ventrue should begin by 1 July 2010, and they expect it to grow into an ebook distribution company with a functioning distribution platform by the end of the year. They're planning to make this a common platform that will work with all of Japan's publishers.
This is very good news because right now there is no ebook market in Japan. The lack of a distribution platform was one of the things holding it back.