Windows Server 2016 reinstates the functional differences between Standard and Datacenter editions. Datacenter will include additional storage replication capabilities, a new network stack with richer virtualization options, and shielded virtual machines that protect the content of a virtual machine from the administrator of the host operating system. These features won't be found in the Standard edition.
Windows Server 2016 licensing moves to a per core model. Instead of 2012's two socket license pack, 2016 will use a 2-core pack, with the license cost of each 2016 pack being 1/8th the price of the corresponding 2 socket pack for 2012. Each system running Windows Server 2016 must have a minimum of 8 cores (4 packs) per processor, and a minimum of 16 cores (8 packs) per system.