Microsoft will release the “Threshold 2” release of Windows 10 in November as the Windows 10 Fall Update.
It has been rumoured November 2nd, but MS have not confirmed that date.
Threshold 2 is the internal code name for the update
The version number is 1511 ('15' for the year and '11' for the month).
Users can update to this version of Windows 10 directly from the RTM release, without having to install any prior builds or updates.
Those upgrading from previous versions of Windows will install the fall update, not the RTM version.
More details here;
https://www.thurrott.com/windows/win...vember-release
Looks like Edge will not be updated with any extensions in this November release. But will be next year. Though its been mentioned that insider builds later this year may have these.