Gabe has clarified that the Redstone builds rolling out to Windows 10 Mobile handsets won't start to appear on Windows Phone 8.1 devices until Windows 10 Mobile has officially rolled out.
Xiaomi mi 4 RSS
Microsoft has finally released the highly-anticipated Windows 10 Mobile ROM for the Xiaomi Mi 4 Android handset, opening up a world of possibilities of the OS running on other devices too.