My Lumia 930 Windows phone just updated to OS version 10.0.10512.1000 (10512). I’m on the Insider Fast Track so is this the RTM or close to it? The desktop and IoT versions of Windows 10 are 10240 so it will be interesting to see where this stands.
It does solve the Universal App build problem with the phone. See : Can't deploy RTM Universal App to phone
Are we there yet .. I guess not:
The latest Windows 10 Mobile doesn’t include a lot of new features, and it mostly focuses on bug fixes and improvements.
From: Announcing Windows 10 Mobile Insider Preview Build 10512 Aug 12
We’re rolling out Build 10512 of the Windows 10 Mobile Insider Preview right now to Windows Insiders on the Fast ring. Thanks for your patience waiting for this one, the team was very focused on our Windows 10 release for PCs and tablets, and we needed to do some prep work for Mobile to move to a new branch. I expect the builds to be out more frequently again as we go forward from here. Our major focus on Windows 10 Mobile right now is on improvements to core quality.
We’ve made quite a few improvements since the last build, but here are a few things that we fixed that were frequently reported by Insiders:
Note: Two factor authentication using your phone number (via SMS) is not working for this build. However, you can use two factor authentication via email.
Read on: http://blogs.windows.com/bloggingwindows/2015/08/12/announcing-windows-10-mobile-insider-preview-build10512/