Microsoft has been quite busy this year pushing out new Windows 10 builds to those in the Windows Insider program. But most of these have been aimed at PC users, which are now on build 14251, provided they're in the Fast Ring. But about Windows 10 Mobile?
Well there's good news and bad news on this front, as announced by the man with his finger on the button, Gabe Aul himself. In a blog post detailing the most recent changes in Windows 10, Gabe mentioned that those currently on Windows 10 Mobile need to be patient for a bit longer before they'll be getting new preview builds.
The good news is that Microsoft has been working on new versions of the OS constantly, and once they're ready to push them out, the Windows 10 Mobile builds will likely be very close in version number to the PC build. This means that users should see some important enhancements once these builds start rolling out.
The bad news is that these upcoming Windows 10 Mobile preview builds, likely from the Redstone development branch, will first be available to the newest Lumia phones: the 950, 950 XL and the 550. Presumably the brand new Lumia 650 will also be on that list. Other devices will only start getting preview builds later, as Windows 10 Mobile officially becomes available on those devices. This approach is quite reminiscent of how Windows 10 Mobile previews first started out with a very limited number of devices being able to receive the update.
As for when these new builds will start shipping, there's no definite answer. Gabe Aul mentioned that Microsoft is "nearly ready to start sharing new preview builds" but didn't give us a definite timetable. With speculation that Windows 10 Mobile has already been delayed a number of times, loyal fans will need to summon up a bit more patience for now.
Source: Windows Blog