Nano Server

• You can now choose to install as Nano Server
• Support for DNS Server and IIS server roles
• Support for MPIO, VMM, SCOM, DSC push mode, DCB, Windows Server Installer and the WMI provider for Windows Update
• Recovery Console now supports repairing network configurations
• Windows PowerShell now comes with a module to make it easier to create new Nano Server images
• Update module to build Nano Server images with a better separation of physical host and guest virtual machine functionality and support for different Windows Server editions
• Improved Recovery Console with separation of inbound and outbound firewall rules
• You can now repair the configuration of WinRM in the Recovery Console

Hyper-V

• Hot add and remove of memory and Network Interface Controller
• Virtual machines are now resilient, meaning they can keep running while their cluster fabric may fail
• Rolling upgrade support
• Hyper-V Containers are now encapsulated in a light weight virtual machine

Containers

• Improved performance
• Network management for containers has been simplified
• Support for Windows containers on Windows 10

Networks

• PacketDirect on 40G
• NIC are converged across tenant and RDMA trafic
• You can now mirror and route traffic to new or existing virtual appliances
• Enables distributed firewalls and Network security groups similar to Azure
• You can now manage the entire Software-defined networking stack with System Center Virtual Machine Manager
• Docker can now be used to manage Windows Server container networking

Storage

• Virtual Machine Storage Path resiliency
• Storage replica support
• Storage Spaces Direct can now aggregate from Storage Spaces on other servers

Management

• PowerShell now has a Package Manager
• PowerShell Desired State Configuration
• Includes Windows Management Framework 5.0 April Preview and DSC Resource Kit
• You can now run PowerShell.exe locally on Nano Server
• New Local Users & Groups cmdlets to replace the GUI
• PowerShell debugging support
• Adds support for security logging and transcription and JEA in Nano Server

Security

• Application authentication support for OAuth and OpenID Connect
• Conditional control over access in the Active Directory Federation Services
• Host Guardian Service provides security between the cloud and guest OS layers
• Server-side support for HTTP/2
• You can now restrict users to have permissions for specific tasks only with Just Enough Administration

Features

• New "Encryption Supported" mode with more protections than for a normal virtual machine, but less than "Shielded" mode, while still supporting vTPM, disk encryption, Live Migration traffic encryption, and other features
• Full support for converting existing non-shielded Generation 2 virtual machines to shielded virtual machines, including automated disk encryption
• Shielded virtual machines are compatible with Hyper-V Replica

And further

• Full OpenGL support including Remote Desktop Services for Virtual Desktop Infrastructure
• Improved time accuracy in physical and virtual machines