I had been wondering if the new Airs use the same battery technology as the newer MBPs, namely the 1000 charge cycle rating. I assumed not since apple didn't explicitly talk about how amazing the new Air's battery was. Anyway, I finally found this buried in Apple's battery page (http://www.apple.com/batteries/notebooks.html):
So I guess it's a mixed bag...not quite up to the level of the MBPs, but certainly better than the old batteries!
The built-in battery of the MacBook Air is designed to retain up to 80% of its original capacity at up to 750 full charge and discharge cycles.
The built-in battery in the new 13-, 15-, and 17-inch MacBook Pro is designed to retain up to 80% of its original capacity at up to 1000 full charge and discharge cycles.
So I guess it's a mixed bag...not quite up to the level of the MBPs, but certainly better than the old batteries!