I started a new character this morning.

Playing through the start caves out of Helgen, I noticed that they've covered over one of the "skylights" into the start cave. Specifically, the one just after the bear, before you exit the cave into Skyrim proper, where the sun shines down into the caves.

What other changes have you all noticed that exist outside of any official patch notes?

I could've sworn I've seen that light dawning on the bear before the patch.

Not the "skylight" that shines onto the bear, the one after it, where the need to sneak to get past the bear (assuming you don't kill it) has been removed.