This is exactly what I envision Apple will do with the iPhone. The iPhone matures enough to replace your PC and then you just wirelessly sling the interface to a variety of "dumb screens," whether it be a tablet-sized screen, a laptop-sized screen with a keyboard, a desktop monitor with keyboard & mouse, a TV, or even a car center console.

Then years down the line, the Apple Watch — or another computing device that is always on you — replaces the iPhone as the centerpiece of your digital life.

As for this Neptune Duo? It demos really well but A) it's too masculine-geeky for mainstream, and B) it'll be severals years until the technology is good & cheap enough to make this idea into something more meaningful.