Two things that have Microsoft confident about Windows 10 Mobile
Microsoft is feeling good about the prospects of Windows 10 Mobile due to two new features. Universal apps will attract developers to jump on the platform and fill up the store. Continuum will allow using a Windows Phone to work as a PC with all the peripherals to make it work.
Source: Information Week
Xiaomi Android phones to get Windows 10 Mobile
Those wanting to run Windows 10 Mobile on handsets without the Microsoft/ Nokia brand may be able to do so in China. Microsoft has stated that it is looking at letting owners of Xiaomi Android phones install Windows 10 Mobile.
This has been tested with a small number of users, but Microsoft looks to open it up in China and possibly let any Xiaomi phone owner flash it with Windows 10 Mobile.
Lumia phones getting Windows 10 Mobile first
Microsoft has hinted in the past to roll out Windows 10 Mobile around November of this year. What it has stated for certain is which Lumia handsets will receive the update first. These include the Lumia 640 and 830, along with eight others.
As for when the Lumias will get the upgrade, slippery Microsoft said "when available".
Source: Windows Central