Microsoft has released a preview version of Windows 10, with the build number 10525, to members of the Windows Insider Program. It's the first such build to be released for members of the Windows Insider program since Windows 10 officially launched.
In a blog post, Microsoft's Windows Insider head Gabriel Aul stated:
"Feedback from Windows Insiders not only helps us build Windows 10 – it also helps us shape how we run the program. For example, Windows Insiders have asked us to improve the flighting cadence and to keep the Windows Feedback app in the product – which we have done. We're also evaluating the Windows Insider rings, and considering whether we should make changes there. Over the past few months we've been looking at feedback to see what changes we want to make going forward. We're putting plans together now, so you won't see any changes immediately, but they will come over time. We'll be doing our best to make sure that we improve every aspect of the program, from build distribution to the Feedback app and Insider Hub. And of course we'll be looking to do more fun things for Windows Insiders as well, like our Insiders to Campus event, Ninja Cat goodies, special wallpapers and more."