Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
I don't think it is going to mean that the games perform comparably on Macintel and Windows. Windows still has DirectX and the Mac doesn't. That is the main difference in gaming between the two platforms.

Microsoft controls DirectX and the OS, so they are totally optimized. Apple on the otherhand controls thge integration of OpenGL, but it is not is own and has had problems optimizing the implementation.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.