(...) overseas registrars won't be able to register .CN domains "starting with January 6, 2010, 18:00 PM (Beijing Time). The registration stop is planned to be temporarily. According to the Chinese registry, difficulties in handling the comprehensive new application material are the reason for this drastic development. The new application material is required since the middle of December 2009, when CNNIC suddenly changed its registration policies."
After an initial change at the end of last year that surprised everyone in limiting purchase of these domains to companies only, the registry has just added a very clear and simple rule: in order to have stricter control over the domains that are sold, they simply and plainly forbid new registrations to registrars that are not Chinese!
Other major non-Chinese registrars such as Go Daddy have also removed the ability to register .cn domains from their sites.