Yesterday it was announced that Microsoft would work with Xiaomi to test Windows 10 in China, but it won’t just be Xiaomi fans who enjoy the optional system, the Nubia Z9 will also get it too.

ZTE have been heading to events and taking cheeky photos of their unreleased Z9 to promote it ahead of the official launch. So far the Nubia Z9 has made its way to MWC where it enjoyed a bit of a photography shoot, and now it has been spotted at yesterday’s Microsoft event in Shenzhen.

What makes this latest sighting the most intriguing is the fact the Nubia Z9 in the photos isn’t running Android at all but Windows Mobile! So will Nubia also be working on a pre-release test for Windows 10 like Xiaomi too or will the Nubia Z9 ship with the OS as an option?

What do you think of the idea of optional systems for your Android phone? Are you interested in giving Windows OS or Ubuntu a try on your device?