There will be three trim levels in the UK from launch, including, C6, C6 Lignage and C6 Exclusive.
There will be a choice of two Euro IV engines: a 215bhp 3.0 litre V6 petrol powerplant or a new Twin Turbo 2.7 litre V6 HDi diesel unit. Both will be mated to automatic six-speed gearboxes.
C6 prices range from £29,500 to £38,000.
All models are set to feature nine airbags (driver, passenger, four lateral, two curtain and a steering column), electrically-operated front seats, an MP3-compatible audio system with colour screen, alloy wheels and automatic operation of the headlamps and wipers.
The new C6 models will also come with dual zone automatic air conditioning and an electric push button parking brake.
Front and rear parking sensors and dual-function directional xenon headlamps are also included.