Found and installed this on my 8707v last week(obviously removed the vendor.xml file)

Works flawlessly, can read and write Japanese and Chinese. Heres the link:
http://http://www.docomo.biz/html/product/8707h/download/index.html

PS.
I checked the site today and they have posted the following message:
Due to a problem discovered in the BlackBerry 8707h Device Software version 4.2.2, available from 7/23 with full Japanese language support, distribution of this software version has been halted. As the technical problem is still under investigation, further details will be provided to customers as soon as they have been confirmed.
We apologize for the trouble this problem may have caused, and we ask for your understanding with this issue.

I am now trying to extract the Japanese language support files for use on other qwerty devices. If anyone has any useful info, please feel free to post!
Thanks