Please see APTLD Position on Top Level Internationalised Domain Names ( http://www.aptld.org/position/APTLD%20Position%20on%20Top%20Level%20Internationalised%20Domain%20Names%20-%20June%2021%202007%20v6.pdf).
 
This document is formed at APTLD Dubai meeting.  It's now being discussed at ccNSO. I don't believe ccNSO has opened the public consultation but nothing prevents us from doing some research right now.
 
Hong