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Display: SHARP IGZO Retina
The iPad Air 2 is likely to have the exact (or nearly the same) display resolution as the iPad Air, the New iPad and iPad 3 that preceded it, at around 2560x1536 pixels.
However, the important changes in this display are going to occur in switching to a different display manufacturing process, referred to as Indium Gallium Zinc Oxide, or IGZO, for short.
IGZO technology was developed by Japanese electronics giant SHARP along with Semiconductor Energy Laboratories. The zinc oxide replaces the silicon used in the amorphous layer in existing TFT displays and has a number of advantages, including a vast increase in electron mobility (over 40 times that of amorphous silicon) resulting in a higher reaction speed over previous technologies.
Moving to IGZO also would mean an even thinner sandwich for the LCD panel and also translating into less weight, as well as improved luminosity and increased power efficiency.
Why do we think Apple is going to IGZO? Because SHARP has announced that as of April of 2012, it would be producing 10" 2560x1600 and 7" 1280x800 IGZO panels in large quantities.
So it would seem iPad Air and iPad mini with Retina Display are both (eventually) getting an IGZO boost.