Microsoft continues to put out Technical Previews of Windows Server 2016 with as-yet-unseen features. The latest Technical Preview, TP3, introduced a number of new features, such as Docker integration and Windows Server Containers, along with improvements to features introduced in previous previews. It also brings new security capabilities such as Shielded VMs, which protect virtual machine contents in a multitenant environment.
The TP2 release debuted Nano Server and a number of Hyper-V, networking, and storage features. It introduced a new Windows Server role named Host Guardian Service, which flags trusted Hyper-V hosts, and included a Windows Server Antimalware feature not found in previous previews. Forthcoming Technical Previews will bring more new features, notably Hyper-V Containers.