I just got back from HK and have been riding the ZIC for about 9 days in a month and a half. It is a great circuit like Laguna except there is no elevation. I have hooked up with a racing team there called BG Performance and they are willing to rent out track bikes (R6, GSXR600). If anyone here is going back to HK and wish to try the only circuit (as of now) in China, pm me and i can hook you up. They have Test & Tune for bikes every morning except Monday so it is very flexible.
You can check out the circuit at http://www.zic.com.cn
ps ZIC is 1.3 hr ferry ride from HK and 20min. taxi ride to the circuit