This one is pretty easy to figure out - the leaker even put his face on the leaked photos.
Taiwanese pop star and racecar driver Jimmy Lin has posted photos of what he indicates is a legitimate iPhone 6 - although they're more likely to be physical mockups than real working phones.
Here, the reputed iPhone 6 appears alongside a smaller iPhone 5.
Lin apparently has some credibility in the world of Apple leaks. He shared a photo of what he said was a miniature iPad in 2010, two years before the real iPad mini hit the market.
Go to the bottom link for more pictures.