According to the update progress, Microsoft officially released the latest preview version of Windows Server 2019 and Windows 10 SDK today. Typically, Windows Server will be released every two weeks, and the Windows 10 SDK will usually follow the client version every week, usually on Tuesday. The current version number of the two versions is currently 17709, and the current desktop version number is 17711.
Windows Server 2019 Build 17709 mainly updates the container, improves the scalability and reliability of the group hosting service account, and provides a new base image for the Windows Server container collection, adding the NanoServer and WindowsServerCore container images.
The main new features of the Windows 10 SDK Preview Build 17709 include support for MSIX and MC.exe. Currently, Microsoft has not released a detailed update log, so there may be other feature updates.