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Power: Lightning and Magnetic Induction
With the introduction of the iPhone 5, iPad 4 and iPad mini, Apple moved to the new "Lightning" connector and phased out the old 30-pin dock connector, much to the chagrin of many folks with older-style accessories.
But the new Lightning connector has many advantages, such as the ability to charge at higher than 10 Watts, as well as electronic inversion for goof-free insertion.
Apple introduced a 12-Watt charger with the iPad 4 for faster charging. The iPad Air includes the same charger. It's possible we may see even a higher wattage charger with the iPad Air 2, such as 15 watts, if Apple has made refinements to the technology.
Additionally, it is possible that we may finally see the introduction of Apple's own proprietary magnetic induction charging, incorporated in the form of an updated smart cover accessory, based on recent USPTO patent publication of filings from September 2011, shown in the illustration above.