Microsoft has finally confirmed that it will roll out Windows 10 Mobile soon. The company has been working on Windows 10 Mobile for some time, and is expected to release it for Windows phones by the end of this year, though nothing is officially confirmed.
Microsoft has been secretive about the launch details of the Windows 10 Mobile and has not yet given out a timeline for the release of the roll out of Windows 10 Mobile. However, it now seems like the update is soon to get launched.
Terry Myerson, head of the operating systems group at Microsoft, has mentioned in an official Threshold 2 announcement that "Windows 10 Mobile will start rolling out to select devices soon." This confirms that the Windows Phone OS based devices will very soon get updated to the new OS. While Microsoft has not revealed the timeline for the release, it's believed the very first set of Windows phone models could get Windows 10 Mobile in early December.
The company might roll out the update to other batches of mobiles will follow at the beginning of 2016. Moreover, considering that Microsoft Lumia 950 and 950 XL are expected to get launched on November 20, Microsoft might as well want to roll out the updated Windows OS for phones sooner than later.
As for the devices expected to get the update this year, the Lumia 640 and 640 XL are expected to be the first devices to receive the update. More details are expected to come up sometime next week, when Microsoft is expected to release a new Windows 10 Mobile build.
Source: Windows Blog