The Lytro camera was an exciting and novel device that allowed photographers and people viewing images online to focus their digital images after they were taken. Expensive and hard to find, the Lytro camera really failed to turn a great idea into a profitable business. Apple has recently secured a patent for a similar refocusable camera that might give future iPhones the ability to shoot images and refocus later on depending on what aspect they'd like to highlight. Nokia's Lumia 1020 already has a similar application called Refocus which works very much the same way (i.e. images posted online can be refocused by viewers). Since iPhones have consistently been among the most used cameras, this feature will expand their functionality. Hope they make it to market sooner rather than later.
Source: Appleinsider