The next-generation Chevrolet Volt will debut at next January’s Detroit Auto Show. GM has released a teaser image of the new model, which seems to have a slightly more rounded rear liftgate.

Other than that, little has been revealed about the second-generation PHEV. In April, supplier sources hinted that the Volt would be offered in a lower-priced version with a smaller battery pack, but a Chevrolet spokesman said, “Volt customers are the happiest customers in the world. We found a formula that works for them, and we’re not going to deviate from that formula.”

The formula certainly seems to be working. With more than 65,000 units sold since its debut in December 2010, the Volt remains the best-selling plug-in car in the US, and has earned the highest customer-satisfaction scores of any vehicle GM has ever sold.

“Volt is the perfect example of the ingenuity that drives everything we do at Chevrolet,” said Chevrolet Chief Marketing Officer Tim Mahoney. “Volt fully delivers on the promises of Find New Roads and will continue to provide consumers with the transportation solutions they need and deserve in the future.”

Source: GM via Green Car Reports