It doesn’t happen very often to see a major paradigm shift in the photo camera industry. Mirrorless was one of them and now Lytro is leading a new revolution. In short, it is the first camera that takes picture without the need to focus on a single point. The full image is in focus and if you want to add some focusing effect you can do it after you took the picture.
The current product is more a toy than a real usable camera and I don’t know if that new kind of photography will play a major role in future. But I will keep a close eye on lytro because I may be wrong and the future will not be DSLR or Mirrorless but Lytro :)