Is the version of Hello on the SP4 the one that is supposed to be super secure? Does that mean the 5MP front camera is a "RealSense 3D camera"? I couldn't get the store to show me it working. Does anybody know if it's really fast? Or works well in different lighting? So you could even use the camera on the SP4 to create 3D mapping of objects. From Intel: Devices with Intel® RealSense™ Camera have three lenses: a conventional camera, an infrared camera, and an infrared laser projector. Together, the three lenses allow the device to infer depth by detecting infrared light that has bounced back from objects in front of it. This visual data, taken in combination with Intel® RealSense™ motion-tracking software, create a touch-free interface that responds to hand, arm, and head motions as well as facial expressions.