But as a result of the darned supply issues, Amazon won't be shipping the Kindle Paperwhite until 18 November. Retail is going to be 8500 yen, and the 3G model will sell for 13 thousand yen. I think Japanese buyers might have better luck getting it from Amazon.com rather than waiting. I expect the supply issues to clear up in the US before long.
BTW, if you're looking for a Kindle app which will display Japanese characters, check out the Kindle for Mac app. It was updated in September and support for Japanese was one of the prominent features.
And in other news today Amazon has also announced the imminent Japanese arrival of their Android tablets. The second-gen Kindle Fire and KFHD are up for pre-order on Amazon.co.jp and will ship on 19 December. Retail will be 13 thousand and 15 thousand yen, and yes Japanese buyers will get access to the Amazon Appstore
Getting back to the ebooks: 50,000 ebooks, can you believe it? When Kobo launched in Japan they only barely managed to stock 18 thousand local titles, most of which were free titles. And as we all know, the rest of Kobo's launch in that country went about as badly as could be.
Amazon is also facing some competition in Japan from Google. The Google eBookstore launched in Japan earlier this month, along with the nexus 7 Android tablet.