The report suggests that current first phase Windows 10 Redstone (RS1) builds running internally are rocking the Microsoft Edge extension support.
With that in mind, Insiders should be getting the extensions within the next couple of weeks, with the word pointing to a pre-BUILD release.
The build in question will be version 14284 of RS1 it seems, although take the imminent timeframe with a pinch of salt, bearing in mind Microsoft's history of dropping updates whenever it feels like.
The major advantage of the update will be that it allows developers to port Chrome extensions to Microsoft's Windows 10 Edge web browser. Away from Insiders, other Windows 10 users will be getting Edge extensions when Redstone lands this June, which is ample time for developers to get their coding fingers walking towards cooking up some excellent extensions.
Like all things Redstone (at least RS1), we expect Microsoft to detail the update in depth at its BUILD conference next month, so it's not long to wait until we get more info. Last week it was revealed that phase 2 of the Redstone update (RS2) will be arriving later than originally planned, likely in spring 2017.