[zaroth]

  I do however, think that they will eventually include both arm and x86
  processors in the Macbook Air. That way, backwards compatibility is
  preserved and low power apps can run on the arm. In the current Macbook
  Pros they have dynamic switching of GPUs, there's no reason they couldn't
  use the arm as a coprocessor or even run the full OS.

Battery life of the Macbook Air is already outstanding. I think I want something more than just better battery life for all that complexity, but eventually it will all be just "taken care of" by the toolchain, so why not?

I think the low hanging fruit would be running iOS apps native on the Macbook Air.