http://arstechnica.com/apple/2014/09/iphone-6-and-6-plus-in-deep-with-apples-thinnest-phones/
We suspect that the 4.7-inch iPhone 6 will end up being the normal version of the phone that most buyers go with, while the 5.5-inch 6 Plus will be the option for people who already know that they want the biggest phone they can get. What's frustrating is that the 6 Plus gets some major, useful improvementsOIS in the camera, landscape mode for most apps, a sizable increase in battery lifethat the standard iPhone 6 isn't privy to. If you want to get the "best" iPhone available, you have to make room in your life (and in your pockets) for a gigantic phone.