A surprise night build was released last night, build 16294, to fast ring insiders. As mentioned on the blog page, this build might not be available for everyone right away, so if you don’t see it, don’t worry too much. However, I was able to get it on both my desktop and my Surface Pro 4.

What’s new? Not a whole lot. As we wind closer to the Fall Creators Update release, the main focus is on polishing and stabilizing the features and OS so the end user has a great experience when they upgrade.

General changes, improvements, and fixes for PC

This build has the fix for the bug that was causing some Surface Pro 3 devices to end up in a “unbootable” state where the Windows OS will not load and it appears to be stuck on a “spinning dots” screen. After installing this build, Surface Pro 3 devices should no longer get into this state. If you have a Surface Pro 3 in a bad state – follow the instructions on this forum post to get back up and running.
We fixed an issue on Dutch builds where explorer could go into a crash loop if an app-requested downloads notification popped up from OneDrive.
We fixed an issue where expand.exe couldn’t expand CABs that contained Japanese characters in the file name.
We fixed a race condition that could result in window content being transparent (but showing the window frame) or stale after unlocking your desktop.
We fixed an issue resulting in some Insiders seeing error 0x800B010C when attempting to upgrade to the last few flights.