Windows Server version 1803 is the next release in the Semi-Annual Channel, and in this release we have continued to prioritize customer feedback delivering further optimizations to the Server Core base container image to reduce footprint and download times. We’re also delivering increased application compatibility, better performance, additional Kubernetes support and continued optimizations for native Linux containers through Hyper-V isolation. We also heard from many of our customers about how tools like the Windows Subsystem for Linux (WSL) improved their management and scripting experience on Windows Server, so they'll be happy to know that the great work showcased on the Command Line Blog is also part of Windows Server, including Background tasks, DriveFS, WSLPath and much more. Beyond that we also now have native Windows versions of popular open source tools including tar, curl and of course OpenSSH.
Source: Azure Roadmap