i wouldn't do the update until it hits the US site, but here is a topic for those interested,
http://www.runryder.com/helicopter/t436659p1/

you can go here and select the radio you have, enter your serial number, and it will open the page with the updates and PDF files. (in Japanese, but you can view the screen shots)
http://www.rc.futaba.co.jp/hobby/11_....cfm?page_id=1

here is the 12Z PDF,
http://www.rc.futaba.co.jp/hobby/11_..._1.3.0_JPN.pdf

there's quite a few added features such as independant volume controls, small case characters, new wing types, etc,.

here is a translator for anyone wanting to read the text,

http://dictionary.reference.com/translate/text.html