The iPad Air and Mini got Apple's A7 chip.
That's essentially the same chip as the one in the iPhone 5S. It's a 64-bit processor and uses the M7 motion coprocessor.
It's also 7.5mm thick, 20 percent thinner than the 9.4mm iPad 4. But, again, the same silicon is used in the much-smaller iPhone 5S, so Apple presumably doesn't have a problem integrating the A7 it into the thinner iPad frame.
The 7.9-inch Mini Retina is four times faster than last year's model, and eight times faster at graphics tasks, Schiller says. It gets 10-hour battery life, as does the iPad Air.
With a 2,048x1,536 resolution Retina Display like the 9.7-inch Air, the Mini's A7 will have the task of pushing around the same number of pixels.