This is really interesting, bring these items together.
- SSD hard drives in new mac book air
- Mac App Store guidelines that applications must not generate excessive heat
- No application open indicator in the dock
- No flash plug in installed.
If they can do this correctly (and i suspect that they can) this will be the biggest revolution in desktop OSs since the original mac.
They want to create a new model of desktop operating system where instead of managing a 'task list' of applications that are open you just click on the icon and go right back to where you were.
Mac OS X developers in future will be expected to spend a lot of time fine tuning applications to make sure that the performance is acceptable. This will have great benefits for the user - as they will really start to see the performance from their computers, rather than have it sucked up by lazy coding of applications that needlessly use too many processor cycles or memory (yes flash plug in, i'm looking directly at you).
I fully expect some model to replace the existing finder for user's documents too. First version will be a bit weird but by 10.8 it will be fying.