No problem! For the most part, Apple likes to make big performance leaps in the "S" cycles (or odd-numbered) A-chips. Here is the breakdown:
- A4 was basically an overclocked A3 (if you can call the 3GS's SoC that)
- A5 brought the first dual-core design (big leap in performance, gigantic leap in graphics)
- A5X was the worst Apple A-chip to date, as it's the only chip to have stayed the same in CPU power as its one-whole-year predecessor, the A5, all while only doubling the graphics power (when the Retina display demanded a quadrupling)
- A6 is the only exception to the rule, since it more than doubled the A5's CPU power (the graphics not so much)
- A6X finally brought an adequate chip for the iPad's Retina display
- A7 brought the first 64-bit architecture to a smartphone and doubled CPU performance (and more than doubled graphics, which is more than Apple claimed)
- A8 was a disappointing chip overall, as it only improved CPU power by 25% and graphics by 50%
- A8X was a good chip, and the only A-chip to date to have a third-core, yet I suspect that third-core will remain unused for most cases
- A9 brought almost double CPU power and graphics
- A9X did something similar to the A9
Basically, for the most part, the "regular" iPhones had pretty boring A-chips whereas all the action has been in the "S" A-chips. However, with all of these rumors saying that Apple will hold back on their "killer" design until 2017, that would mean that they would spend more resources on the design rather than on the SoC. This would imply a better-than-expected A10 chip while an averagely-improved A11.
Of course, if Apple doesn't deliver the "killer" design until the iPhone 8 (or 2018's iPhone), then I would expect a weaker A10 and a stronger A11.