Well the iPhone 6s and 6s Plus haven’t even reached all the major country shelves worldwide and we’re talking about the iPhone 7 already. Today more info about Apple’s A10 chipset surfaced, saying that the chip may offer up to 6 cores. It will also be included on the iPad Air 3 apparently.
In the meantime, you should know that the iPhone 6s and 6s Plus come with the Apple A9 SoC, that offers a 70% CPU performance boost from the Apple A8 and relies on a 16 nm production process (some sources say 14 nm, but it’s still up for debate). Last I heard the Apple A10 was being shipped exclusively by TSMC, but the new rumors talk about a three pronged approach.
Aside from Samsung and TSMC, Intel may also get a piece of the orders, if Apple does decide to go with a 14 nm manufacturing process. The same source that details the A10 also gave accurate info about the A9 ahead of its launch, so we tend to believe it. So aside from having 6 cores, the chipset is said to focus on multi threading. It’s also not clear if they’ll opt for a 14 or even 10 nm manufacturing process.