This was in the Japan Times this morning:
Despite flaws, Rakuten is 1-0 against Amazon in Japan's e-book wars
By AKKY AKIMOTO
Rakuten, Japan's largest online shopping mall — and a head-to-head rival of Amazon Japan that also hopes to expand its business globally — launched its first e-book reader, the Rakuten Kobo Touch, on July 19, getting the jump on the long anticipated Japanese release of Amazon's Kindle.
http://www.japantimes.co.jp/text/nc20120815aa.html
It is mainly a recap of what happened with the KT introduction in Japan to date, concluding with a question as to how soon a Japanese Amazon Kindle will be in Japan? Depends on the publishers' whims.