The nice thing about these input devices is that they don’t require anything special in terms of hardware — maybe a duplicity of some parts, but not expensive ones — all the smarts are in software. This can only mean two things: the devices will get smarter and smarter as time goes on, and, they will (soon) become standard parts of computers (and indeed, all devices), enabling a new field of naturally human-interactive applications. Definitely something to look forward to.