Not to what I hear.But you are right about the AMD thing making more sense that intel. But intel hates Microsoft because of AMD and the delay of vista, so I guess that was more of a business thing. They should have just moved to the Cell Processors (which are similar to the PowerPCs) if they were worried about the PowerPC's heat and power issues. But as of right now, apples (hardware wise) are outperforming their PC equivalents.
And they only reason people are using x86 stuff is because RISC doesn't have market support. Not because of the performance (which is not as good as RISC). Why do you think CISC is following the RISC philosophy more and more?
That's what it boils down to. Getting people excited about buying your product. Besides, its intel we are talking about. They aren't cheap at all. They are horribly overpriced…. On second thought, good move Apple.

*edit
and you are right (in respects to intel and AMD being more powerful than PowerPC) only because of their 64 bits. As far as I know, there is no 64 bit support for apples yet. Is there? and I am pretty sure they are not using 64 bit chips in the intel apples, so if that is the case, then no, they are not.