Bloomberg reports that Apple is exploring ARM-powered Macsk:
Apple engineers have grown confident that the chip designs used for its mobile devices will one day be powerful enough to run its desktops and laptops, said three people with knowledge of the work, who asked to remain anonymous because the plans are confidential. Apple began using Intel chips for Macs in 2005.
Not exactly a surprise; it’d offer more efficient power usage, it’d provide Macs with another unique advantage over other PCs, and Apple would control another key technology.