I'm afraid the
extra-long battery life will go away as soon as Apple release the eagerly awaited (by me, too) iPad mini with Retina display
-- but I'm fine with the very long "standard" iPad runtime of 10 hours, too.
(I'm a lot more dissatisfied with the iPhone's rather weak battery life. And, of
course the ideal situation would be to charge an iPad every 3 or 4 weeks, like you do with a hardware Kindle device. But that's utopia in 2013. Then again, the Kindle device itself and its extremely long battery life would have been utopia 20 years ago, so...)