Apple has no need to release OS X to 'Apple certified' hardware.
Steve Jobs keynote at WWDC left me with the impression that the OS X porting to x86 was done 'just in case' the Mac hardware market tanked. In other words, Apple would have turned into a software company as a last resort.
Well, the Mac hardware market is doing well. With Macintel machines, performance will match the general PC. We will have powerful machines running OS X from Apple.
Such a superiour machine alone would drive converts and sales.
I expect with either OS X.5, or OS X.6, the ability to run all Windows apps.
What Uncle Ben Taught Me About Mac Hardware