So the release of Windows 10 on July 29th 2015 was known as Threshold 1. The current release is the Threshold 2 build. It was released on November 12th 2015.
Threshold 2 bring several specific enhancements to Windows 10. Some of those things are not possible in build 10240 (Threshold 1). An example of this would be installing Windows 10 with a Windows 7, Windows 8, or Windows 8.1 license key.
There are some other generic improvements that also come with Threshold 2. In the end there are several major and minor things that make these two builds different enough that warrant separate tags.
I feel this is an important to decide, because when the next update,
Windows Anniversary Edition is released Microsoft Edge will support extensions. So any answers to questions about Microsoft Edge today might not apply to a user running Windows 10
Windows Anniversary Edition in a year.
It will be possible to defer
Windows Anniversary Edition and Threshold 2 for a period of time on Windows 10 Professional and Windows 10 Enterprise installation. So although these updates are "required" there is still a legitimate need to separate questions even if we are only applying these changes to old questions asked before these updates are released.
So how do we separate Windows 10 questions? This same question can be applied to the next updates
Windows Anniversary Edition in 2016. Looking forward the changes between these builds, will be as different as, Windows 8 and Windows 8.1 are to one another.
As somebody who performed the update to Threshold 2 I can say to the end user, it appears that Windows 10 is being installed again, so this is a major update. This isn't as simple as installing a service pack.
So my suggestion would be to rename the current
Windows-10 tag to
Windows-10-TH1 and update the description. Now that Threshold 2 is officialy released we should create a
Windows-10-TH2tag and update the description to indicate the difference between the two releases. I feel this would would be similar to the
Office-XXXX tags we have currently.
Below is a screenshot of the next Windows Insider branch (RS1_Release) which is believed to be the
Windows Anniversary Edition aka the
Threshold 2 is known as the Fall Update which will be reported as
Windows 10 Version 1511 (for 2015 November) and and likely be the 10586.3 build.