The name for both these twisting motions is gyroscopic precession.
It is evidently a gyroscopic effect, being reversed in direction by a change from a right to a left-handed twist of rifling, and being increased by an increase of rotation of the shot.
The input device may look like a TV remote at first, but delve a little further and you will find gyroscopic technology within.
Apparently, the company is planning to release a controller with motion-sensitive technology -- not unlike the gyroscopic variety found in the Nintendo Revolution -- to work in tandem with the PS2's Eyetoy peripheral.
The graphics may not be as powerful, but the forthcoming titles are said to be innovative, fresh, and intuitive to control, thanks to the gyroscopic technology in the Wiimote.