Microsoft has been quietly testing some builds internally to be released next week for Insiders in Fast Ring and Also for Insiders in Release Preview for Both Threshold and Redstone 1. Now there is a new Threshold Build which has been sighted online being tested internally with version 10586.589 for Windows 10 and Windows 10 Mobile.
This could be another new Cumulative Build to be released to Insiders for Threshold Branch for Windows 10 and Windows 10 Mobile. The last released build for the Threshold Branch is 10586.545. The new build has been compiled on Tuesday 6th Sept.
Currently there is no information as to what will be the features or fixes to be released with the new Cumulative Build for Windows 10 and Windows 10 Mobile.
— BuildFeed (@buildfeed) September 10, 2016
We do not know as to when can we expect this build to be released, but, if the company does not find any new bugs or issues with internal testing then the new build could be released to insiders on Threshold branch as early as next week.
We will update this article once we have any information on the release date of the Threshold build to Insiders on Release Preview.