Original Link: http://www.anandtech.com/show/8131/manual-camera-controls-in-ios-8

Joshua Ho, writing for AnandTech:

To be clear, iOS 8 will expose just about every manual camera control possible. This means that ISO, shutter speed, focus, white balance, and exposure bias can be manually set within a custom camera application. Outside of these manual controls, Apple has also added gray card functionality to bypass the auto white balance mechanism and both EV bracketing and shutter speed/ISO bracketing.