Apple's latest patent application details a new camera flash system that would optimise the flash based on the photo's subject. It combines a flash redirector, a touchscreen and imaging sensors that concentrate on scene conditions.
This combination of elements could be used to provide the equivalent of a touch-to-focus for light or dark areas of a soon-to-be photograph; a touch-to-illuminate feature. The system could be incorporated into iOS devices, the iMac, MacBooks and even a dedicated video camera. [Patently Apple]