Amazon is developing a number of new hardware products to complement its Kindle line, The Wall Street Journal is reporting. Amazon hopes to release the devices, which are being developed at an Amazon lab in Sunnyvale, California, in the coming months, but the WSJ is quick to note that some or all of them may be killed at the last minute for a variety of reasons. One of the devices is a high-end smartphone featuring a screen that allows for 3-D images without glasses, these people said. Using retina-tracking technology, images on the smartphone would seem to float above the screen like a hologram and appear three-dimensional at all angles, they said. Users may be