Intel does NOT equal X86.
intel is very good at fabbing processors and they are very very efficient at it.
Apple will not be using a P4. It will more likely be something along the lines of Itanium (which, contrary to uneducated opinion, is a VERY good CPU, but with very litte software support).
In fact, I would say that it would be an all-new chip.
Either that, or intel is merely a sub-contractor who fabs for IBM. Whoa! that would be...