If one is to believe The Wall Street Journal the much-rumoured Amazon Smartphone will have at least one gimmick to beat the competition-- a retina-tracking display capable of creating "hologaphic" floating images.
The glasses-free display will also allow users to "navigate through content using just their eyes," the WSJ sources continue.
Holographic or not, the smartphone is said to be in development at Amazon's Cupertino Lab126 facility, alongside a second (probably) more conventional handset, an "audio-only streaming device" and an online video streaming TV STB. Such hardware efforts are reportedly known as the "Alphabet Projects," since internal nomenclature involves imaginative use of the, well, alphabet (as in Project A, B, C, D...).
The WSJ has very little actual details on the devices in question-- the sources even warn "some or all" of the devices might even end up in development hell due to concerns of the performance or financial variety.