"It's hard to imagine Intel going out of their way to create a processor for anyone, but themselves. However, it appears that Intel is making a habit of taking custom processor orders - specifically from Apple. It started out small with a custom Dothan processor for the Apple TV and then a custom Merom processor for the recently announced MacBook Air.
None of these custom orders have been drastic, but they are not typical of Intel. Typically, Intel sells a platform (ie: Centrino) or a chip to its customers and then they would do their best to accomodate Intel's products into their own. Even the original Xbox's processor was an "off the shelf" Intel Pentium III based design. Not even the almighty Microsoft could sway Intel for a specially catered design for its first console.
But times are changing."