Just to test for some of you guys, I opted out of insider and rebooted.
(Dual Sim 950XL U.S.A)
I did get a "Windows Phone" update from the store as soon as I rebooted. But still no firmware update available.
Currently 10586.36 with 15454 firmware
Not saying that Insider enrollment does\doesn't have an affect. But I tried it out both ways for ya.
I'm sure I'll get FW update soon regardless. No issues with phone anyways. Almost flawless for me. Other than a few lagging notifications for one of my Outlook accounts, I can't even find anything to complain about.