bmw has released more images of its redesigned 2010 Z4 Roadster. To be officially unveiled next month at the North American International Auto Show in Detroit, the Z4 will be offered in sDrive30i and sDrive35i guise, the car has been completely redesigned inside and out. In addition to a new 3.0-liter engine, the new Z4 boasts a number of mechanical improvements, including the option of a seven-speed dual-clutch gearbox.