This is a recent interview with the PRC CDC head, which includes:
1. Discussion of various vaccines. He confirms that their vaccine(s) are using the standard method (inactivated viruses), which a priori one might consider safer than the new mRNA type. Efficacy remains to be seen but he seemed to hint that they would be releasing some data/results in the next few days.
2. He notes (at ~7m) that PRC is sequencing every new case of covid. They see all the mutant versions, and find that infections are coming both from visitors to PRC as well as from imported food/packaging! So the latter really happens.
If anyone can find primary sources related to these topics I would be very interested.
Here is some discussion of the different vaccines: costs, ongoing validations, etc.