If you are wondering why I have a micro four-thirds camera on the way instead of a NEX, this is a big part of it. For me, it's about compactness, lenses, and then megapixels I probably don't need to worry about. (My standard refrain is that if I need megapixels, I'll grab my RB67)
Well, that, and because Sony's overall corporate interest in delivering quality seems to have gone way down from what it used to be.
I find the Pentax Q interesting from a historical perspective. See, a long long time ago, Pentax made a really nice SLR system oriented towards the 110 film format. If you don't remember 110 film, it was one of the many attempts from Kodak to market more consumer-friendly film formats that just looked silly compared to any of the perfectly good 35mm cameras ranging from point-and-shoot to decent sized SLR....
Most folks have been aware of Lytro since the papers their technology is based upon have come out. Lytro is not magic. By capturing a complete 'light field' with multiple sensors per image pixel, a photographer can selectively re-focus images.