I think that's a sign that Apple is starting to take games seriously on the desktop. It's, in part, what made the iPhone successful after all.
It was likely behind Steam being ported to the Mac, so it wasn't nothing. But that move hasn't borne nearly as much fruit as one might have hoped.
And the continued existence of the performance gap between OSX and win7 via bootcamp is not a good thing. Apple needs to take a much more proactive position on correcting that. Maybe the problem is with drivers, maybe it's missing frameworks, maybe it's third party developers starting with directx and not following through with an OpenGL port. Whatever it is, they ought to put more effort into correcting it.