The first phone being tested for the program is the Xiaomi Mi 4. Microsoft chose the phone because its users have a history of responding quickly to software updates sent out by the manufacturer. Xiaomi has made it clear that it is still committed to Google's open source OS and is essentially just a bystander when it comes to Microsoft's test.
During the recently held WinHEC hardware conference in China, a video was made that allegedly shows the Mi 4 running Windows 10 for Phones. You can check it out by clicking on the video below. Will Microsoft's program help it pick up some converts to Windows 10?