Last week, Insiders on the Fast ring were presented with Windows 10 build 10586. Luckily, those on the Slow ring will now be able to get in on the action too as Microsoft has now released the build to those users.
Windows 10 build 10586 is probably one of the more important builds to date as it is the likely candidate for release as the upcoming "Fall Update". While that has yet to be confirmed, various sources are stating that this update should hit general users on November 10th. If this information is true, we should see an update sometime tomorrow.
Microsoft's Gabe Aul also said today that while the ISOs for build 10586 are not yet available, they should arrive in "a couple more days".
Source: Gabe Aul