It's just a quick story detailing what was patched and why. If you're a Mac user, you need to check out their updates pages. For the rest of us it is just a passing curiosity.
As I've said before; I don't think Apple is particularly forthcoming in matters of security. In fact; I'd rate them lower than Microsoft in this area. There is no doubt, though, that they can and often do respond quickly to a threat.
The Mac OS X is indeed coming under greater scrutiny from a security standpoint. That's good, as it will lead to holes being plugged before they become real problems. But it's also bad because malicious types can use security research as a jumping off point in finding vulnerabilities, and they will, too.
I do think the time is come for Mac users to run an anti-virus. Don't run out and spend all your dough on one. Try ClamAV, which is free and open source. For right now, that is all you need and as ClamAV is improving so rapidly, it may well be all you'll ever need.
You can find out more about ClamAV for the Mac at this url.