Microsoft first started testing the next big Windows 10 update, codenamed Redstone 4, with Skip Ahead Insiders in late August. Now, as we draw closer to the Fall Creators Update release, it looks like Redstone 4 will be soon making its way to testing for general Fast ring Insiders.
As spotted by Neowin, a Microsoft representative on the Windows Mixed Reality Developer Forum has warned developers that they may want to adjust their Insider settings, because other they may begin receiving unstable Redstone 4 builds starting October 10:
For those of you developing VR experiences for the new Windows Mixed Reality immersive headsets, we have an important message: if you stay in the Windows Insider Fast ring, beginning October 10, 2017 you may begin to receive RS4 builds, which will not be the most stable builds for mixed reality development. To continue mixed reality development uninterrupted, please switch your Insider settings to receive "just fixes, apps, and drivers" without getting a new Windows build from the "Windows Insider Release Preview" ring.
That strongly indicates that Redstone 4 builds will start hitting the Fast ring tomorrow. However, it's worth noting that the Windows Insider Program is pretty fluid as far as build releases are concerned. While plans may be in place to flight a Redstone 4 build on October 10, any major bug could delay things. Nothing is official until we see Microsoft announce a new build is rolling out.
Currently, Fast ring Insiders are on Insider preview build 16299.15, which is the latest Fall Creators Update build. The Fall Creators Update is set to start rolling out on October 17 alongside the launch of Windows Mixed Reality headsets from Microsoft's hardware partners.
Windows 10 'Redstone 4:' What to expect in Microsoft's next big update
