Yesterday Gabe Aul had revealed that instead of Build 10575 they were planning to push newer Windows 10 Mobile build under testing to Windows Insiders. Now, if rumors have to believed it may be Build 10581 that is coming today or tomorrow to Insiders in the Fast Ring.
It is not known though what this build brings, but above image gives us an idea that this build exists somewhere and may be the one under testing in Microsoft’s internal rings. We can hope that Gabe pushes that Red Button soon. In the meantime check the screenshots above, though they don’t reveal anything new.
Thanks Xio-Feng for the tip. Cheers!!