Microsoft released another new build (preview build: 17101), as part of the Redstone 4 development, to the Windows Insiders in the Fast Ring. They have also announced a new Skip Ahead build 17604, which is the first public build from the new RS5 prerelease branch.
Though there are no significant changes in build 17101, but it contains a set of improvements and fixes to stabilize the final release going to happen in Spring 2018.