Safeguard Defenders has launched a resource center on extraditions to China. They describe it as follows:
As the first of its kind comprehensive guide to understanding China’s extradition law, China’s domestic legal system, and how it is at odds with international norms surrounding extradition and human rights safeguards, this resource will hopefully be useful for all legal practitioners and academics who are either engaged in defending against an extradition to China or seeking to understand how the system works.
The site will be regularly updated. Check it out!