The M6 Gran Coupe is set for a world Detroit debut in 2013, but BMW is starting to build up some anticipation by releasing a few teaser images of the car. The Gran Coupe, a four-door version of the M6, has a 560hp engine, a seven-speed dual clutch trans, and the full M body kit. We'd love to get this and the C63 AMG out on the tack for a little fun. 

[via Motorward]