So, I’ve upgraded to 2.7. I mostly see cosmetic changes, so I can’t really say it’s better or anything.
As for East Asian language support, I still had a problem getting the characters to properly display, even after I installed the necessary .mo files. The .mo files “localize” your WordPress installation, and will change your sidebar text and date headers to whichever language you have selected. Beyond that, I don’t know what they do. They appear to have no effect on the text of the posts themselves.
In order to get East Asian text to display properly, I still find the easiest solution is to remove the following lines of code from your wp-config file:
define(‘DB_CHARSET’, ‘utf8′);
It defines the character set your WP will use to create the database. I don’t know how this affects material from the DB displays, but it does.
After having removed it, I see no ill effects, and I’ve done this since version 2.6.3!