It's already been a month since Microsoft released via proletterof Windows 10 Insider previewed build 10130. Since then, the company has released two different patches to fix the build, and has internally released more versions of the upcoming OS. 
Today, however, Microsoft finally released the next build to those registered with Windows Insider. The company states that Windows 10 build 10158 is "full of stability and quality improvements, as well as some additional UI finishes".
Windows 10 build 10158 is available through the Windows Fast Ring Insiders.
Most importantly, this build is that the company itself states that there are no "known issues."
According to Microsoft:
We don't have any significant known issues for this build worth noting in the blog post but we are servicing several issues so make sure you check Windows Update for those.
The official release of Window 10 will be just over a month away, and as it seems Microsoft has pretty much refined its new operating system approaching the RTM version.
We will install the new build and let you know that we notice remarkable.
