Microsoft has just revealed that the following smartphones will be able to participate in the Windows 10 Mobile Insider Program starting early next week: Lumia 950, Lumia 950 XL, Lumia 550, and the LG Lancet. An update will also roll out to the Windows Device Recovery Tool, which will help detection issues on these devices.
Interestingly enough, the new Windows 10 Mobile devices (Lumia 950, 950 XL, and 550) were not able to update to new Windows 10 Mobile preview builds, even though these devices are the first to run the operating system. Starting early next week, those who own these devices will be able to enjoy new preview builds via the Windows Insider Program!