Basically you won't need to swipe your fingers over smallish touch screens.
You'll move your arms, hands and fingers (or whatever else applies) in the air or will shake the handset.
The phone camera(s), the G-sensor, the compass and so on will be used by a software to understand the gestures and to translate them into control commands.
This breakthrough comes from a company called GestureTek, a non-startup company in this field.
The idea seems to be brilliant, but a number of issues are just behind the corner, like privacy and politeness in crowded places.