Hello @HinataGrape-6694 ,
Under a Non Disclosure Agreement (NDA) Microsoft shares with Partners and Customers new Feature Roadmaps and planning to deploy Azure Services on Specific Regions. Please Find an Azure partner and start having access to NDA information so it can help you on your business decisions.
Also, please let us know if there is a guideline period from preview to GA for other Azure services.
I would recommend you the Azure Charts Dashboard, it is developed by an internal Microsoft Employee and is showing information based on the first source of truth of Azure Updates here: https://azure.microsoft.com/en-us/updates/
Thank you!