Well, I'd rather like to see the changelog from 3.8.6 to 4.1.10 instead. This is the only changelog I found, not sure how true it is. And that means that there are almost no changes since 3.8.6.
See a detailed blog. I don't advocate Victor update the forum to the latest version, but maybe there is a useful remedy (I'm the news vBulletin does not follow). All the same up to him.