Mercedes-Benz released the first official details and new pictures with the A45 AMG. The most powerful version of the A-Class comes with a more aggressive look and a sportier behavior. 
In these new pictures, the production model wears a black tape on the lower part that covers the front bumper, the grille wings, the center section of the rear diffuser and the side skirts.
On the outside, the A45 AMG has a more aggressive grille and bumpers, new side skirts and a revised air diffuser. Under the bonnet we find a 2.0 liter turbocharged four-cylinder engine with direct injection which provides 330 hp and 332 lb-ft (450 Nm) of torque. 
The power is transferee to the all wheels via an AMG Speedshift DCT 7-speed transmission with dual-clutch. The A45 AMG is offered with a revised suspension and with a new braking system.

Source: Mercedes