I haven't confirmed these reports on my own machines. My primary Win10 box is still at 1709 -- hasn't been selected by Microsoft for this latest update yet, although I expect it will within a few days (next Tuesday is Patch Tuesday after all).
I'm on the Insider Program but this report is about the formal release, not a preview.
On a related note, the Windows 10 Insider Preview Build 17661 was just announced: