Earlier this week, Microsoft released Windows 10 Mobile Insider Preview build 10586.338 to the Release Preview ring. Now, that build is making its way to PC users too.
As with the Mobile version of the new build, Microsoft hasn't provided a changelog for the PC version of 10586.338. However, since this is a minor cumulative update, it's unlikely to include any new features, focusing instead on bug fixes and other incremental improvements.
The build's rollout to the Release Preview ring brings it a step closer to its anticipated release this month as the next cumulative update for all Windows 10 PC and Mobile users not on the Insider Program.
The most recent update to Windows 10 for non-Insiders - known also as the 'Production branch' - is build 10586.318, which was released on May 10.