Good news for you Windows 10 fast ring users as there is a new build 10586 to download and test drive. Word on the street is this is the long awaited Threshold 2 build. Check the rest out at Betanews.

Source: Betanews
Microsoft is preparing a huge update to Windows 10, codenamed Threshold 2. We don’t know exactly when it will be made available, only that it’s coming this month.
In advance of that update, Microsoft is in the process of rolling out a new Insider Preview build which has all the hallmarks of being a test run of Threshold 2, or the Fall Update, as it’s likely to be known.
Instead of tweaks and new features, build 10586 is all about bug fixes and general improvements. It’s "very fast and smooth, and makes a great daily driver", according to Microsoft’s Gabriel Aul. That’s not something you’d normally hear about a Fast ring release.
So what can you expect to see in this new build? Microsoft shares the following improvements:

Source: Betanews