It's not the best kept secret that Mercedes is developing a drop-top version of the S-Class Coupe, but these are the best spy shots we've seen yet of the luxury convertible out piling on the miles during testing.
Estimated to appear in the Stuttgart firm's line-up just before the year is up, the S-Class Cabriolet looks pretty much as you would expect, sharing the Coupe's swooping front lines and angular rear-end. As with the recently spied C-Class Cabriolet, the flagship drop-top will use a fabric hood design to save weight and space.
It’s not just styling that the latest member of the S-Class family will inherit from the Coupe, as engines and in-car tech will also be carried over. Kicking off the Cabriolet range will be the S 500, featuring a 449bhp 4.7-litre bi-turbo V8, and this will be joined later by the AMG-tuned 576bhp S 63 and 630bhp S 65.
Mercedes is similarly set to throw in crystal-infused LED headlamps and daytime running lights – designed to create a clear beam – and the Magic Body Control suspension system that scans the road ahead and leans the car into bends to compensate for body roll.
The new Cabriolet will complete the latest S-Class family, joining a line-up that already includes the saloon and Coupe, as well as the recently launched extended-wheelbase Mercedes-Maybach S 600 and the mammoth Pullman luxury limousine.
The Coupe debuted in the UK last September, but sources at Mercedes don't expect to see the Cabriolet on sale until at least next winter. It's likely to add around £10,000-£15,000 to the price of the S-Class Coupe, which currently starts at around £96,000.