I find this lightfield idea quite enticing, however I think it's been done way before it's mature enough to hit the open market. Basically I see it as science writing a cheque that technology, as it stands at the moment, can't cash.
Science and technology are closely intertwined in that technology feeds directly off science. However to put it in basic terms: science defines what should be possible, and technology defines what is actually possible from a given science, and that is the problem with the Lytro. The science is there, but the technology to implement it at the moment is woefully lacking.
So what have we got? Currently we have a company that needs to monetize their R&D investment. Quite possibly due to cash burn and shareholders/investors snapping at their heels. As a result they've released a pretty much proof of concept product onto the market that, apart from it's proclaimed killer function, is vastly inferior to even the cheapest compact on the market, and at a price that would only appeal to the übergeek and/or the well healed hipster.
I hope I'm wrong, but in my years of following technology, releasing somthing where the tech employed is not mature leads to the product, and company, falling into the gutter, often never to be seen again.
In my opinion this doesn't bode well for the future of Lytro as anything more than a cult digital equivalent of the Holga/Lomo cameras