The 2014 event will take place on the island of Barbados.
McLaren has denied it is set to lose more key team figures ahead of the looming Honda era.
The official Porsche Team driver will take part in the Cévennes Rallye and in the Tour de Corse.
Maximilian Götz has put one hand on the 2014 Drivers title.
Third straight year in series' only U.S. appearance.
Car owner worried about driver's young age -- but it worked out.
World Finals set for November 6-8.
Motorsports personalities attended the event, held in Miami.
Katherine Legge, Antonio Felix da Costa to drive.
IndyCar driver Ed Carpenter, Al Unser, Jr. among those scheduled to appear.