Toyota is planning to unveil a new version of its best-selling Prius hybrid at the Detroit Auto Show in January.

The Japanese automaker has been tight-lipped about details thus far, but previous reports indicate that Toyota is actually planning two new versions of the Prius – one larger than the current model and the other smaller.

"It will be an all-new model with more comfort, better styling and more versatility," Don Esmond, senior vice president of Toyota Motor Sales told the Detroit Free Press. The news source speculated that the "more comfort" description could mean that the larger model will debut at the auto show rather than the smaller one.

Toyota has committed to green technology in recent months, with plans to unveil a number of models over the next few years. The company will debut a plug-in Prius hybrid next year. It's also working on an electric version of its RAV4 crossover.

The company has been working with luxury electric automaker Tesla Motors to develop its hybrid technology. Toyota recently invested $50 million in the small automaker to solidify their partnership.

Drivers interested in purchasing a car may want to consider a used Toyota, as the pre-owned models are less pricy than their newer counterparts.