A day ahead of the 2014 BMW M4's official unveiling, a passel of leaked images have surfaced online. Preliminary reports indicate that the vehicle will be powered by a 3.0-liter TwinPower Turbo six-cylinder, good for 431 horsepower and 405 lb-ft of torque. Power goes to the rear wheels of the 3300-lb M4 Coupe, enabling it to accelerate from 0-100 km/h in 4.1 seconds and an ultimate top speed of 250 km/h (155 mph). An optional M Driver's Package boosts that figure to 174 mph. Rumors of a carbon fiber reinforced plastic (CFRP) roof panel are confirmed, which combine with aluminum hood and front panels to shed 83 pounds from its M3 Coupe predecessor. Check out detailed looks below.