Today, Microsoft released the fourth Insider Preview build of the next version of Windows Server, bringing the build number to 16278. The last one, 16267, was made available just a couple of weeks ago, which implies that the company is continuing its pace of releasing updates every two weeks.
Oddly, the firm hasn't actually announced the new build, which means that there's no way of telling what's actually new. It's available for download from the main Windows Server Insider Preview page though.
It's likely that this build mainly includes bug fixes though, as Microsoft has confirmed that it will be releasing version 1709 of Server at its Ignite conference later on this month. Because of this, it's safe to assume that it's close to being finalized.
The feature update will contain quite a bit, such as the Windows Subsystem for Linux and Delivery Optimization for updates. It also includes features like Persistent Memory in Hyper-V, Battery Passthrough, and various other improvements.
It appears that the Remote Server Administration Tools still haven't been updated, as they still have a build number of 16250. As soon as Microsoft publishes release notes for the new Windows Server build, we'll keep you updated with what's new.