The iPhone supports 5 simultaneous touches, and cancels them all on the 6th touch.
Current iPad models (through Air 2) support 11 simultaneous touches, and do nothing on a 12th touch.
What will the iPad Pro support? With such a big screen, will it maybe support two sets of hands at the same time? Still only 11 touches? If there an official document that lists this info?
My app uses the max # of touches to allocate drawing buffers and audio voices. I'm hoping to start updating what's necessary before November when the hardware is released, and the Simulator doesn't help.