Could this be the upcoming Voltec Buick?

Buick Riviera PHEV Concept debuts in China



Link


"It's nighttime in China, and Buick has just concluded an evening event the day before the first – and only – press day of the Shanghai Motor Show. The star of this evening's party was the Buick Riviera concept vehicle, a plug-in electric hybrid coupe that the automaker says gives a glimpse at its future design direction."


Notice the center hump that goes from the front to rear seats, just like the Volt and ELR.