The iPad wouldn't consider going to an Intel processor until Bay Trail in 2014.
A MacPad is possible using Haswell in 2013 but that would require a touch-based Mac operating system. Then the 2013 Mac touch OS could go on the 2014 Bay Trail iPad. Also, does Apple support both a Mac touch OS and a Mac regular OS and do something more than Microsoft ? And then, the iPhone keeps the iOS and so that's three operating systems.
Then since that's three different operating systems, the iPad actually keeps the ARM processor but a MacPad with a Haswell processor is added.
The iPad is only concerned with being a coffee-shop touch-browser. If something more is wanted that's a MacPad. An iMacPad ?
In 2014 there will be an iPhone with an ARM processor, an iPad with an ARM processor, a MacPad with a Bay Trail processor, and a MacPad with a Hawell processor.
See, the stock market analysts confused a coffee-shop browser ramp-up with a longer PC replacement cycle. The coffee-shop browser ramp-up will top out and at about that same time a PC replacement cycle will begin. But one doesn't really drive the other.