I have said this for years and every one goes no no intel this intel that processor change this processor that. I go look apple is going to start the process of having the entire OS written in a higher level language or a modern level C so that they can combine it and all the built in libraries over to ARM. Then it is a simple re-compile for most not all applications to join the ARM OS X train. This is where apple is going. There is no reason to update the Dock or Finder ETC with a total re-write to a new language otherwise. They are moving the ball slowly and in clear view to ARM. The first mechanical cooled ARM chip is now in the ATV. They are getting ready to see how far they can push the Atv it is a low risk product with low sales currently. They can latter on push it hard and if they fail they have good understanding of thermal loads in the wild. They are going to make a MacBook A series chip. This is going to happen when is the only question I have left. They have several sub-systems left to migrate on the UI side of the house. They also need to start to get developers into the idea that the apps need to be universal again. This push will come with a new heavy push for the App Store. This why the universal binaries are handled on the back end away from the user. The arm user will not know they are using arm unless they look at the specs. This is where they want to go. So you can write it one time and have it run multi thread monster on the Mac Pro or multi thread mini on the ARM in the MacBook scales perfectly and is universal. This is where apple has pointed the ship. Intel has nothing on the road map at the sub 15 watt chip size that punches. I know now I will get the people who go but arm is not intel the benchmarks don't compare etc etc. This is going to happen. So strap in for the next decade cause it will be ARM and it will be universal binaries and it will all feel like a throw back to the early 2k.
Can't wait.