WIN10 17025 has been released for early beta and insider testing as documented below

http://www.eweek.com/enterprise-apps/windows-10-to-gain-more-settings-in-post-fall-creators-update-build

The next version of Windows 10 is already taking shape and some early adopters can get a peek at what Microsoft has in store today.  Now that that Windows 10 Fall Creators Update is making its way to users—although not all at once since Microsoft distributes updates using a phased approach that can last months—the company is offering members of its Windows Insider program an early look at what the future holds for the operating system.  The latest build, number 17025, contains features that may eventually make it into Redstone 4, the codename for the upcoming, yet still unnamed major Windows 10 feature update. This time around, the company is focused on refining the operating system’s settings experience, particularly for people who use accessibility options.