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The second technical preview of Windows Server 2016 will be released next month (May).
According to Microsoft, the next generation of Windows Server is being developed and targeted for an early 2016 release.
We haven’t seen a new build of the software however since October 2014.
Microsoft have indicated that they will be releasing a tool to extend the expiry date of the current Windows Server Tech Preview soon, while they prepare to launch the second tech preview of the OS in May.
Microsoft hasn’t given an exact date but it’s safe to say that after BUILD is a reasonable time to expect these bits.
source:windows10update