If you want to know more about Windows Server 2016, Microsoft has created a eBook as .pdf that you can download.
Go to https://info.microsoft.com/TheUltimateGuideToWindowsServer2016.html and fill out the form, download and learn.
There is also an other e-book that you can download from here: https://blogs.msdn.microsoft.com/microsoft_press/2016/09/26/free-ebook-introducing-windows-server-2016/
and here is the What’s New in Windows Server 2016, it has not been updated today so it still points to TP5 https://technet.microsoft.com/windows-server-docs/get-started/what-s-new-in-windows-server-2016-technical-preview-5
Categories: Windows Server 2016