The Hong Kong Internet Registration Corporation, the .HK registry, has applied to ICANN to introduce the Chinese character version, and if successful, with offer a buy one, get the other free with registrants receiving both versions of the domain name.
Since 2007 registrants of .HK domain names have been able to register all but the .HK part of the domain name in Chinese characters, and should ICANN grant HKIRC the Chinese character version of the .HK ccTLD it will mean registrants can have complete domain names in Chinese characters.
To register your .HK domain name, check out EuroDNS here.