Actually the Chinese central government has issued multiple ordinances pushing IPv6 adoption, the latest in 2017/11/26. If you can read Chinese, you can read it here http://www.xinhuanet.com/2017-11/26/c_1122012631.htm.

But from my own experience, the actual execution of the plan is glacially slow. I don't know why. Chinese government usually is very good at execution, but not when it comes to IPv6.