My understanding is that a large point of the Boot Camp Support software for Windows is that it's literally supplying device drivers for the Apple hardware that's generally (or rather, exclusively) not available elsewhere. Although the fact you did get an "updated automatically" message indicates (to me) that Windows did find a newer driver out there in its repository for that hardware, not from Apple!
I'm glad things are still working as there was a healthy chance that whatever Windows found on its own may not have worked properly. Also I seriously doubt that Apple ever updates the Windows drivers for a 2012 MacBook Pro. But it all appears to be good.
You could take a dive into the Windows Device Manager for things like the Display and Audio hardware and see if one of the drivers show a very recent date (far newer than the rest of the sound/video/webcam/usb/etc).
If everything seems fine to you though, it's probably still fine. My biggest concern would be to make sure sound playback and recording doesn't glitch, and that the graphics don't glitch and are giving all the performance I want (especially for games).
Now this would be mostly academic, but if you were really curious in addition to seeing if any of the drivers stick out in terms of the date you could look up the PCI Vendor ID listed for the driver and Google search that to see if that's the same for some non-Apple device. For example, if the Audio hardware, or USB controller PCI Vendor ID shares the same ID as some random HP or Dell laptop that was recently added/updated to the back-end Windows driver repository, that would have updated. But as long as Windows claims to be happy with the drivers it should be all good. But if you could isolate which driver was updated past the rest of the Apple-supplied drivers you could thoroughly test out that piece of hardware and its performance.
So I don't think it's a glitch at all, but I do think it is something along these lines.
