A company called Lytro claim to be producing a light-field camera that has a key feature that the focus point can be moved after the image has been taken.
Their claims have been questioned by jwz, a well-known blogger who says he can't understand how their diagram/explanation makes any sense. He points out that it includes lenses, which are about discarding the very information about light fields the company claims to capture.
The web-site includes some demonstrations which would be moderately easy to fake (Take the original shot with a Frazier lens, and then blur selective parts afterwards, or lots of photos of each layer photoshopped together.)
The web-site notably does not include any photographs of a prototype product.
Is this a real product being developed? A fake? Or is there another option?