There's a good chance the Macs they announce will be the last of their kind with x86 CPUs. The long awaited Mac Pro next year may be the last x86 Mac ever shipped. The A12 is on par with all but the fastest x86 CPUs, and the A13 or A14 (let alone one purpose designed for laptops/desktops) could seamlessly slot into Macs.
Fat binaries, dynamic translation would take care of all the OS X side issues, the only worry would be Windows. Microsoft kinda/sorta supports ARM64 Windows again, which includes x86->ARM translation, but who knows how long that will continue?
Biting the hand that feeds IT
