The ZTE Nubia Z9, which hasn't been officially announced by the Chinese-based smartphone company, was spotted running a version of Windows 10 for phones at Microsoft's WinHEC 2015 hardware conference in China this week.
The ZTE Nubia Z9 was spotted by MyDrivers.com and, while it has yet to be announced by ZTE, previous leaks show that it was running Android. It's also a high-end device in terms of hardware. It has a 5.2-inch full HD display, a Qualcomm Snapdragon 810 processor, 3GB of RAM, 32GB of internal storage, a 16MP rear camera with object image stabilization, and even an 8MP front-facing camera.
The fact that the ZTE Nubia Z9 is running Microsoft's next OS may show that the company is planning to launch Android and Windows 10 versions of the same device, similar to what HTC did with the HTC One M8. There's also the "experimental" program that Xiaomi and Microsoft are working on to place a ROM of Windows 10 in the Mi 4. We should hopefully know more about ZTE's strategy for the Nubia Z9 in the near future.