We've seen many, many mockups of the purported iPhone 6 over the past half year — tons — and even though all of these mockups are just that, as time progresses, they may actually be getting closer to what the final end product could be.
As we get closer to the manufacturing start date of Apple's next smartphone, supply-chain leaks tend to become more accurate. We saw it with the iPhone 5, iPhone 5S and the iPad Air.