Amazon is in the process of developing two smartphones, one inexpensive model and one with a 3D eye-tracking interface, TechCrunch has learned. The details are somewhat sparse, but are corroborated by sources and reports from earlier this year. Amazon is planning two devices, the first of which is the previously rumored ‘expensive’ version with a 3D user interface, eye tracking and more. Both devices were under the ‘Project B’ moniker before the news was leaked on WSJ earlier this year. The expensive model’s code-name has since been changed to ‘Duke’ and now ‘Smith’ — and a release is not planned this year. Details of the devices appeared on a HN posting via a throwaway account earlier on Thursday and TechCrunch verified some aspects of the posting with our sources and came away with some additional information.