Dell's super-thin, depth-sensing tablet is available now for $400

Dell's super-thin, depth-sensing tablet is available now for $400:

Remember that 8-inch, super-high-res tablet Dell showed off back in September? You know, the one with the depth-sensing camera? It's OK if you don't, but really, you should give this a second look -- yes, even if you have tablet fatigue. Dell's Venue...