Microsoft has been working on improving the Redstone OS for Windows 10 insiders on RS1. The company had earlier in the week released a new preview build for Insiders in Release Preview ring.
Now a new build has been sighted online with new version 14393.316. This would be another Cumulative Update which would be released for Insiders and may be Non Insiders in the next week. Currently we are not sure as to what would be the features or fixes that would be coming to RS1 Insiders. The new build has been compiled on Sept 28.
— BuildFeed (@buildfeed) September 30, 2016
We will update this article once we have some more information as to the changelog.