R&D at Apple can be summed up by the iPhone 5. They developed a new SoC in the A6, made the screen thinner incorporating the touch sensor which was novel and c

R&D at Apple can be summed up by the iPhone 5. They developed a new SoC in the A6, made the screen thinner incorporating the touch sensor which was novel and created new manufacturing processes for building the case. All of these obviously flow to the other products e.g. iMac, iPad Mini.