There are speculations that the next generation iPhone (aka iPhone 5) could possibly sport an eight megapixel camera.
Omnivision, Apple's supplier for camera sensors, was reported to be 'not yet ready' with its 8-megapixel sensors for mid-summer launch. It is said that Sony might be supplying the 8 megapixel sensors for the first wave iPhone 5 orders.
OmniVision 8MP cam not ready for iPhone 5, Sony jumping in? [electronista article link]