The plug-in hybrid model is described by Porsche as little more than a concept, but the company will be gauging public reaction at the show to see whether an estate version of the Panamera could be added to the range in the future.
It's got a longer roofline than the standard Panamera and a more abrupt rear end, helping to increase boot space.
The Sport Turismo also previews a few of the design cues that will find their way on to the revised Panamera early next year. The front end is now far more sculpted, with sharp creases on the bonnet, reshaped headlights and a much larger grille.
The interior is recognizable from the current car, with its prominent rising centre console, but everything has been simplified. There are fewer buttons and a new LCD screen in the dash, which replaces the traditional dials in the current car.
Underneath the new bodywork is an example of what Porsche calls an 'e-hybrid' powertrain. It's a plug-in version of the hybrid system used in the Panamera and Cayenne Hybrid models, but with additional power. In this instance, it's a 328bhp 3.0-litre V6 engine mated to a 94bhp electric motor. Together they can launch the Sport Turismo from 0-62mph in less than six seconds.
In pure electric mode, the car can be driven at up to 75mph and cover almost 20 miles. That helps to achieve fuel economy of 80mpg and CO2 emissions of less than 82g/km.
The Acid Green colour used for the brake calipers and the Sport Turismo badge are set to become trademark features of Porsche's performance hybrids. We expect to see this technology used in the Panamera range by 2014.