Microsoft team has announced the availability of new Windows 10 Insider Preview build which is first one from RS4 channel which will hit the floor after Fall Creators Update (RS3).
Below is the chart which will illustrate more about Skip Ahead.
In this build, some general feature enhancements are done and no major new features added. You can get Windows 10 Insider Preview Build 16353 for PC if you have turned Skip Ahead in Update Settings and are receiving builds in fast ring.
For what is improved and changes in this build, read post on Windows Experience Blog.