It's been long rumored that Amazon is working on a phone, but according to a new Wall Street Journal report, that phone may have a 3D display. Anonymous sources say that Amazon is actually working on two phones, including a high-end model with a glasses-free 3D display, a concept that was tried some years ago with the Evo 3D smartphone. It could also, they said, have eye tracking for control — something Samsung has been working on in a more limited capacity. Some sources have said users would be able to navigate through content with their eyes, and eye tracking could also improve the 3D effect, allowing the phone to tell where users are looking and refocus in response, rather than having a single "correct" viewing angle.

According to the WSJ, this may be only part of a large, and very strange, push for new prototypes. Besides the phones, Amazon is allegedly also building an "audio-only streaming device," like an iPod for the cloud. A set-top box is also supposedly in the works, something that would make sense given Amazon's push to be a streaming destination. Some of the devices are apparently targeted for a reveal in the "coming months," but some may also be shelved — something that wouldn't be surprising for such apparently experimental devices.