Microsoft, in their Skype FAQ page updated that, the Skype app will continue to work on Windows Phone 8.x and Windows RT devices until early 2017. This also includes some Android, Mac and iOS devices running older version of the OS.

It’s because of their move towards transitioning Skype experience on cloud. Skype for other systems will not have any impact.

After the release of Windows 10 Anniversary Update followed by couple of fixes as cumulative updates, Microsoft now started pushing new insiders build from the development branch for fast ring Windows Insiders. Initially, this will have no big features, but some structural code changes.

As it is going to be serve from development branch, will have bugs. Find what's new coming with this build and the issues already known to Microsoft.