Couple of days ago we reported that Microsoft is internally testing lot of Builds for Threshold, RS1 and RS 2. Last week we reported that Microsoft is testing new threshold Cumulative Update with version .622 for Windows 10.
Now a new Threshold build has been sighted online with version 10586.639 for Windows 10 and Windows 10 Mobile.The new build has been compiled on 14th Oct. This would be the new Cumulative Update for Threshold Branch which the company is internally testing.
— BuildFeed (@buildfeed) October 19, 2016
Currently we are not sure as to what fixes the company is testing in the current Cumulative Update. If the company does not find any issues during internal testing then we could see the new Cumulative Update coming to Threshold Branch early next week.
We will update this article once we get our hands on the changelog of what the company is pushing or fixing with the Cumulative Update.