Anybody here get the "Mystery Software Update"?

I got the update alert tonight, but nothing came of it when I updated. Still on build 013. That is on my XL.

Wife has normal and got her alert. She will do it later when I can see if anything changes.
 
My 2XL picked up a 51MB "critical" update early this morning.

I am still showing build number OPM1.171019.013
 
Looks like I won't be getting it. That's fine. I'll wait for the February update :).
 
As long as it's not like the mystery update Apple gave it's phones awhile back. :P