It's only been a couple of days since Microsoft released Windows 10 for PCs build 16273 to the Fast ring, but there's already a new one available with build 16275. The build doesn't contain any new features.
After all, it's from the Redstone 3 Development Branch, meaning that it's a preview of the Fall Creators Update, which is slated to be finalized next month. From here on in, we should expect mainly fixes.
And indeed, there are quite a few fixes listed in the changelog:
We fixed an issue resulting in Asphalt 8 not accepting input in recent flights.
We fixed an issue from recent flights where when Slideshow was enabled resuming from sleep a second time might place the Lock screen in a state where it couldn’t be dismissed without pressing Ctrl + Alt + Del.
We fixed an issue that caused minimized per-monitor DPI aware windows to miss DPI changes and end up with a mix of DPI scaling upon restoring.
We fixed an issue in XAML resulting in text animations appearing slightly blurry in the last flight until the animation had stopped (for example, when loading the main page of Settings).
We fixed an issue resulting in progress wheels on certain websites in Microsoft Edge unexpectedly moving out of place during their rotation.
We fixed an issue resulting in an unexpected change in mouse sensitivity in the last flight for PCs using non-default display scaling.
We fixed an issue resulting in the taskbar being unexpectedly thick if you booted up the PC while plugged in to an external monitor with a different DPI.
There are no known issues listed, which doesn't actually mean that there are no known issues in the build. Microsoft's Brandon LeBlanc actually said that known issues just aren't going to be listed anymore, at least during the rapid release period the precedes the Fall Creators Update.
One thing that you'll want to be aware of is that some x64 versions of Windows 10 Pro and Enterprise aren't available just yet, including the following languages: "EN-GB, FR-FR, DE-DE, RU-RU, PT-BR and several others." Microsoft will have these published soon.
Also, if you chose to Skip Ahead to Redstone 4 development, you won't get this build. You'll have to wait until Microsoft starts shipping RS4 builds; however, if you switch back to the Fast ring, you won't be able to Skip Ahead again.