Microsoft announced that it would change licensing for Windows Server 2016, “Standard” and “Datacenter” version. Licences is moving to per core, not per socket.
Below is a table that compares the two editions:
* Windows Server Standard Edition license permits 2 OSEs (operating system environments) when all physical cores are licensed.
** Azure-inspired features for advanced software-defined datacenter scenarios.
*** See Licensing Datasheet for additional detail. Minimum license requirement: 8 cores per processor, 16 cores per server.
General Windows Server 2016 licensing information, including licensing criteria and terminology can be viewed here.
Here Windows Server 2016 datasheet: Download