Having recently unveiled the regular C-class estate - which will be priced from £28,055 when it goes on sale in the UK this autumn - work on the performance version is almost complete.
Mercedes plans to launch four variants of the C63 AMG. Alongside the estate pictured here, a saloon, coupe and cabriolet will also be built. All are due to go on sale before the end of 2016.
As this latest prototype shows, visual changes on the car include the adoption of new alloy wheels and heavily revised front and rear bumpers. New side skirts can also be seen, alongside a more muscular rear bumpe which fully encloses the quadruple AMG exhausts.
Power in all four models is set to come from a new twin-turbocharged 4.0-litre V8 engine, with outputs varying between 480bhp and 580bhp. That would eclipse the 451bhp offered by the naturally-aspirated 6.2-litre V8 engine in today's car, while performance gains should also improve on its claimed 0-62mph sprint time of 4.5 seconds.