UPDATE: The 2013 Mercedes-Benz SL63 AMG has been revealed. Click here for all the info and photos.

Mercedes-Benz is working on a brand new generation of its SL-Class luxury convertible, and once again there will be high-performance AMG variants, the future V-8 powered SL63 AMG captured here in our exclusive spy video.

That sound emanating from beneath the hood is a variant of the 'M157' 5.5-liter twin-turbo AMG V-8 cranking out an expected 571 horsepower.

That may not seem much higher than the outgoing model’s 525 horsepower, but its expected peak torque of around 650 pound-feet is certainly higher than the previous model’s 465.

Look out for the car’s auto show debut towards the end of the year, but for now enjoy the video.

Click here to watch the spy video in full via our YouTube page.

After the video, click here to read up on the 2013 Mercedes-Benz SL63 AMG and here for the more mundane 2013 Mercedes-Benz SL-Class.