Oh, I also got a weird KNOX related pop-up after I updated that was:
An attempt to access a secure area on your phone without authorization has been blocked.
Make sure your phone is protected by updating the security policy to the latest version from Samsung.
For more information, visit samsung.com/us/secureandroid"
I didn't allow it to update or do anything and after another reboot I haven't seen it or any other similar message again. Here's to hoping it stays gone.