Stereo imaging has been around since the viewmaster. I presume we're not talking about that. Our Nikon metrology tool uses focus stacking to provide quantitative depth spacial information. That's not very fast so I'm assuming that's out. I guess if the gyro sensors are good enough, it' basically tomography... I'm guessing that perhaps our computing arsenal availabe in phones is good enough these days for this...
A smart ohone with 3D imaging can be a useful aid to visually challenged . They can get the exact idea ofd the 3D world, especially those who have lost one of their eyes and hence may have difficulty in constructing 3D images in their brain, I suppose.
Google is right on target on next gen product features in the tablet market. Movidius may end up being Google's own just like Oculus was acquired by Fbook.
Apps are the key to the success of 3D-vision capable tablet. For example, if users can image and successfully reproduce a graphical / CAD model of the object, then we will have democratized product development without having to use more expensive 3D scanners.