Are we seriously comparing a 10 Hour Macbook Pro and a 3 Hour MBA?
After having owned several Rev A and Rev B MBAs, aside from heat, which I got software to control, and lower processing power, which I worked around, the BIG deal breaker was poor battery.
Last years refresh lineup of alu models included the MBA. Hence, it's been left behind this year (
what you're still expecting a lonesome MBA only "quite" refresh later this year??) .
And the MBA will further be left behind once we start seeing iPad cases with integrated hard keyboards. (I know not a "real" computer, but an entry level plastic macbook PLUS an iPad is cheaper than a SINGLE comparable CPU powered MBA.)
The public has now been introduced to that iPad– a device that realistically runs 12+ hours, and coming back to a 3+ hour device will be unacceptable for the keepin' it real light crowd.
Apple now doesn't care for one ultra thin and light, it wants you to think of a thin/light iPad added to whatever laptop you choose.
MBA is soon to be EOL, so get your collectors edition now while they last.