Download link:
http://love394.3322.org:81/soft/gujian/%E4%B8%81%E6%9E%9Ca320_1.6V.zipAccording to the posting in the Chinese BBS, the menu improved. For example, when choosing a game, it's said to be possible to show a preview picture
But they also say it is a pre-release especially for the idingoo forum and contains bugs. The thread-starter states he already switched back to the V1.2. So IMHO it's better to wait a litte more.
Edit: OK, I just took a shot, upgraded to 1.6: I played around a few minutes and noticed the following changes:
-you can now choose to display games in "Directory" mode (like before) or all games in one list
-preview screens: If you started a game once already, there will be a (random?) preview screen in the menu the next time
-you can protect the internal memory and turn off the speakers in options-menu (not sure if it was possible before though, hehe)
-movie player pauses play with Y (i think that's new)
(the download link above contains the usual languages incl. english)