GM released only this single image of the unique Pontiac Solstice SD-290 Concept. The Solstice features a cover over the passenger compartment that evokes vintage single-seat racers of yore and even includes a new windscreen and separate review mirror mounted in the middle. It's likely powered by something that's green since it is the theme of many of the cars.

Hmm... interesting. I've gotta see photos of this thing!