The red sports car you see pictured in the above sketch is a new Lexus Concept model created specifically for Gran Turismo 6 and its forthcoming package of DLC (Downloadable Content) vehicles created under the Vision moniker to commemorate the 15th anniversary of the racing game series .
From the concept's silhouette, we can make out it's a coupe model and that it doesn't look related (at least not directly) to the new RC and RC F cars due to the different design of the profile window line.
As with most other upcoming concepts of the GT6 Vision series (excluding Mercedes which went as far as presenting a real-life sized model ), Lexus and Playstation are keeping hush about any details surrounding the model, so we'll just have to wait it out to learn more.