While we generally do not focus on a car's "rear end", this concept from Porsche will be an exception. After months' of rumors and spy photos, the Porsche Panamera Sport Turismo finally surfaced this morning at Paris Motor Show. A direct competitor to Mercedes-Benz's own "Shooting Brake" effort, the Porsche Panamera Sport Turismo is a mere concept at this time, albeit a very functional one since it shares many of the components on the current Porsche Panamera model. One particular exception would be the rear trunk design, extended now to be more of a Shooting Brake silhouette. More information and images to come as Paris Motor Show gets underway this weekend.