Is it 60 Hz like the phones/touches?
Apple DTS has not changed any of their answers about 60Hz refresh rates with respect to any device model, and no one has reported any higher rate.
Update: In 2017, Apple introduced new iPad Pro devices capable of higher display refresh rates than 60 Hz.
Apple introduced 2nd generation of iPad Pro models in June 2017 which feature ProMotion display technology, which delivers refresh rates of upto 120Hz. ProMotion also improves display quality and reduces power consumption by automatically adjusting the display refresh rate to match the movement of the content.
It comes in two variants with 10.5" and 12.9" screen sizes.