Foreign Language support is currently available on the Cybook Gen3.
You are able to load any True Type Fonts (TTF) pretty easily, so if you have the fonts on you computer, you should probably be able to display documents using the font.
Its probably doubtful on the Kindle in the near future, unless they decide to launch internationally. The major advantage and disadvantage of the US market is its uniformity after all, and while they might soon have (if not already) support for spanish, french, etc. Asian language sets are doubtful.
Think that a Korean company has launched a ebook device as I remember seeing a thread about it.
Yes, here it is
https://www.mobileread.com/forums/showthread.php?t=18494
and it talks about the Soribook
http://www.soribook.com/index.jsp , Translation fo the specs is
here