Microsoft is now rolling out Windows 10 Build 16257 for Windows Insiders in the Fast Ring. This build brings some new features, improvements and as well as some bug fixes. As we know that Fall Creators Update is nearing its Release to Manufacturer (RTM) build so most part of this build will be bug fixes. Microsoft has also released build 15237 for Windows 10 Mobile.
The major changes in this build are that Microsoft had started the beta testing for Eye Control that we had earlier reported. You can enable that by going to Settings > Ease of Access > Other Options > Eye control. Similar to the Game bar now there is an Eye Control launchpad which is enabled when you turn on Eye Control. You would require special eye tracking hardware like the Tobii Eye Tracker 4C to use this feature on your PC.
Fluent Design system is also introduced in Microsoft Edge browser with this build. The tab bar now uses Acrylic material that provides depth and transparency effect and makes it look beautiful. While the remaining part of the changelog is all about improvements and bug fixes.
To download this update via Windows Update you must be enrolled in the fast ring of Windows Insider. To enable the fast ring go to settings>updates and security and join the Windows Insider program and select fast Ring in the options.