Found this on GMI forum but references 01/05 Road and Track. Speculation on a possible future coupe version of kappa.
"While the previous Opel 2-seat sports car shared its underpinnings with the Lotus Elise, the next-generation sports car from GM's German unit will be based on the Kappa platform that has spawned the Pontiac Solstice and Saturn's new roadster. Unlike the open top U.S. cars, the Opel is shown here as a coupe; remember, the Solstice was shown in concept form as both a coupe and a roadster. The GT is evidence that a coupe version may not be far behind for the U.S. market."