The process do not gives much headroom in our knowledge, the core is just now a LOT wide and with a big L3, so my bet is in a far more aggressive turbo clock speed (2Ghz??) with only a 10% boost in base clock frequence, that is around 0.9Ghz in iPhone 5 and around 1.2Ghz in iPad Air.
The big question is in what this strong turbo will translate in real world performance as the Tskin goes up and the cpu throttles down.
The GPU will be sure faster so likely Apple is referring to an aggregate +30% in performance CPU+GPU.
Yes, performance is a better word, however speculation has its clock upped to 2.0 GHz over 1.3 GHz today, which would be in the stated speed bump range. The disappointing thing to me is that almost everyone--even supposed TSMC insiders who claim to be making the A8--say it will still be a dual-core, which puts Apple behind again, since quad-cores are in many high-end smartphones from others.
These are very nice and most awaited for Apple Users, Other brands have gone far beyond as compared to Apple Phones in terms of hardware. But at least now Apple uses will be able to used the power of hardware as the new phones will be using A8 processors and 1GB RAM. One can say that now Apple will have to follow other Manufacturers for hardware changes. In case of phablet Apple will be following other manufacturers as Apple is not the first to introduce it.
I think a larger display as compared to iPhone 5 was very much needed to compete with Samsung and others and it is good to see that might come with iPhone 6. What would be a approximate price of iPhone 6?