According to Sony's CEO, Sir Howard Stringer which was in an interview with Walt Mossberg that the shipments of camera sensors to Apple have been delayed due to Japan's earthquake last month.

As you know that OmniVision is known as the supplier of image sensors for all Apple's mobile products so far, so this is strange to hear that Sony will be a camera supplier for Apple.

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Stringer just said that their camera image sensor facility in Sendai was affected by the tsunami. Getting image sensors to Apple will be delayed.

Stringer's discussion of camera production for Apple was confirmed by The Wall Street Journal:

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Early on, he raised the irony of Sony supplying camera components for Apple devices. It "always puzzles me," he said. "Why would I make Apple the best camera?"
It is unclear what devices he was talking about as Sony isn't known to supply key camera components, known as image sensors, to Apple; A Sony spokeswoman declined to comment and an Apple spokesperson couldn't be reached for comment.

In light of this, the assumptions is that the cameras will be for an unreleased Apple mobile device which may in early production stages. That assumption draws renewed attention to the Street report in April 2010 that the iPhone 5 would pack an 8 megapixel camera from Sony. The same report also predicted a 5 megapixel sensor for iPhone 4. So that we can say that Stringer's comment is evidence that iPhone 5 will have 8 megapixel camera.

[SOURCE1][SOURCE2]