According to a report in the Wall Street Journal, Amazon is working on a smartphone for release in the second half of the year. They're currently aiming to announce it by July and launch the end of September. One of the differentiating features of the phone is its capability to display 3-D images. "..the phone would employ retina-tracking technology embedded in four front-facing cameras, or sensors, to make some images appear to be 3-D, similar to a hologram." However, it may not be just a gimmick for 3-D movies and TV shows: "Sources tell Re/code that one advantage of this display will supposedly be that the phone can be moved from right to left to navigate, so a user can interact with the interface with only one hand." The report's sources say Amazon has been demonstrating the phone for developers in San Francisco and Seattle, but they're likely to have difficulty luring developers away from established platforms.