Apple made so many trade-offs on nMB that introduce a lots of topics to us. Here, with the slim body & low performance (relatively) implementation, makes me thinking of Arm based Mac which has been mettioned so many times. There are many in common, and exchangable points. so, are we close to such a machine or never? Here are my thoughts: From tech & design's aspect: 1, even iPhone6 surports 4K screen. GPU is ok. 2, with SMP, two or more Arms can replace Core M. (performance, batteries, peripherals etc. are ok) 3, with iOS App Store, OS & SW, would be much easier to transfer from Intel -> Arm than PPC -> Intel 4, iPhone, iPad, Mac together could get the same CPU features. 5, definitely could keep it slim From Apple's aspect: 1, control products evolution cycles 2, cut the cost, make more money 3, Leading a new "Arm inside" PC market. 4, MB is independent line now, expandable. I mean, it would not hurt Mac if failed. Upper aspects makes me believe it will happen. But on the other way, I can conlcude it will not happen. From Apple's aspect: 1, cooperate with Intel, all Macs are growing steadily up. minimize risks. 2, High end still rely on Intel, so unneccessory to make Macs two splited systems. 3, If Arm could not catch up with revolving steps of Core M, this would be a weak(relatively) machine. 4, The most important point, they don't want design such a computer. Then what are your opinions?