Azure services launch has two stages: Public Preview and General Availability (GA).
Private Preview and Limited Availability are also possible but rare. A service is typically in Public Preview for a short while (1 to 6 months) in its early lifecycle stage, without an SLA and at a 50% discount of its planned price at General Availability. Our Term define that preview services are provided 'as-is' and that we may decide to change or discontinue a preview service at any time.
For most updated service parity between Azure Global and Azure China, please refer to Service Parity Summary. You are strongly recommended to visit the Azure China Website in a regular basis as new services are launched in an on-going basis.