In case you haven't heard, the Hyundai Genesis Coupe is in for a redesign in the 2013 model year, and the Korean automaker is planning to officially unveil it at the Detroit Auto Show, this January.  There's been heavy speculation as to what this return to the drawing board means for the 2013 model. Some think it could be cosmetic in nature, while others are hoping that it's more performance-driven. Tameron Hyundai…