The name most likely indicates that the new concept is a coupe, since the original teaser indicates that the new variant is not a roadster. Kia's first teaser also included a statement saying the concept will "demonstrate the flexibility of the original design." A coupe version seems to fall with in those guidelines.
Those are the only details known for now. The concept will make its official debut on January 11 at the North American International Auto Show. Stay with Automobile Magazine for the latest on the Soulster and other Detroit debuts.