@Padtawee Srisan-ngam Thanks for reaching out. The main addition includes VNet injection and larger resource limits. We expect to support multiregion and availability zones at General Availability (GA), and private endpoint support may be available sooner. Please note that these plans are subject to change.
You should be able to find information in docs for premium v2 which are live now please refer: https://learn.microsoft.com/en-us/azure/api-management/v2-service-tiers-overview
the documentation for feature comparison is updated now please refer: https://learn.microsoft.com/en-us/azure/api-management/api-management-features
do let me know incase of further queries, I would be happy to assist you.