I am hoping that Apple just jumps head-first into the 64 bit world. Particularly since iOS 7 is developed for it. I would be a little disappointed if the mini only had an A6/A6X- although I'd still buy it.
I agree totally that Apple should jump on the 64-bit A7X opportunity for all new iPads and AppleTV. This will give them a year lead, minimum, over the competition... By then, it may be too little, too late! I hope that the only consideration is A7X price -- not supply constraints. Apple can afford reduced margins to gain first-to-market advantages.
A7X iPad Minis and A7X AppleTVs could be the breakthrough gaming and content streaming offering that takes AppleTV out of "hobby" status.