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Display: It's highly likely the screen size will increase. In order to stay above the 4/4S PPI, it would require a screen with the suggested resolution.
PPI: Coordinates to being equal or larger than 4/4S while supporting new screen size rumors.
Storage: Apple doubles the maximum capacity options for a device every other generation, and giving flash prices, we can safely not expect a 128 GB iPhone 6
CPU: The A5X is large and consumes too much energy for a phone. There is a reason the iPad 3, which is already much larger than the iPhone, was required to be a little extra thicker. The 4S already stumbles a bit with it's battery life compared to the 4, and given the rumors of an even thinner phone, there is no way the A5X will find its way inside the iPhone 6. If Apple is waiting until the fall, the A6, which will be as fast if not faster and be more efficient, will be ready and we can safely assume they will go that route for the 6. We will see if they go with a higher processor speed or higher core option.
GPU: This is the haziest of all departments, but we can safely assume a PowerVR 6 as that is their latest offering. My guess is dual-core would suffice, but as with the CPU conundrum, it's up to Apple's geeks to way the pros and cons.
RAM: Doubled every generation, this is a given.
Camera: Increased by 2-3 MP each generation, though they may jump in MP substantially by 4 as 12 MP parts are already falling into competitor smartphones.