Windows Server 2016 is available in 3 editions Essentials
Standard Datacenter.
The Main difference between Windows Server 2012 and 2016.
Physical Memory Up to 4TB 2012 and 24TB 2016
Physical Processor up to 320LPs and 512 LPs
VM memory support up to 1TB per VM and 12 TB
VM CPU support up to 64 vCPU and 240 vCPU
Nano Server
Nested Virtualization
UEFI Secure Boot
PowerShell direct to the Hyper V host
Rolling upgrades for Hyper-V and Storage clusters
Linux Secure Boot
ADFS v4 ,
The Resilient File System (ReFS)