https://www.bleepingcomputer.com/news/microsoft/windows-10-preview-build-17738-released-with-fixes-for-edge-and-the-start-menu/

You can always tell when Microsoft is getting close to finishing a major update as they start to release Windows 10 Insider Preview builds that do not contain any new features and are comprised of only bug fixes and minor improvements. Such is the case with today's release of Windows 10 Insider Preview Build 17738.

This build is part of the Redstone 5 branch, which is the next major feature update due out in September or October 2018. While there are no new features or major improvements added to this build, there are two notable bug fixes.