I heard to fight the Hackintosh crowd that Apple is considering migrating Mac OS X to ARM based devices for their next Macintosh evolution. That way they can control what devices run Mac OS X better, and since iOS is Mac OS X based and runs on ARM chips it would be easier to port Mac OS X to ARM based Macintosh systems and possibly have a virtual machine on ARM Mac OS X to run iOS apps as well.

They of course would have to buy a chip maker that can make 64 bit ARM CPUs with at least quad core to save on costs. I think Apple wants to get rid of buying chips from Samsung because of the iOS vs. Android lawsuits.