If you've been a fan of the retractable hardtop on the Mercedes SL->ke950 and, prepare yourself for some bad news. Apparently, the next-generation SL will be available only as soft-top models. The SLK, which will share its underpinnings with the SL in the next generation, will carry on with its hard top.

The changes are still significant enough that it could alter the look of the SL. But that's the gamble Mercedes->ke187 in trying to reduce the car's weight. In some ways, that could be a boon for fans of the luxury roadster, as less weight means it will use its power more effectively.

Speaking of power, the next-gen SL and SLK models are also expected to be offered with new engines, including four- and six-cylinders for the SLK, and a new 3.0-liter, inline-six for the SL. Performance numbers haven't been announced just yet, but the four-cylinder in the SLK is likely able to produce around 240 horsepower, with the six-cylinder ticked significantly higher at around 335 horsepower to 435 horsepower. As for the SL's new inline-six, that baby could have 365 ponies on tap.

With all these changes in tow, don't expect these changes to happen soon, as a next-gen SL isn't expected until 2021.

Note: Current Mercedes SLK pictured here.

Click past the jump to read more about the current Mercedes SLK.

Mercedes SLK

The US market gets its own share of SLK models in the form of the SLK 350 and SLK 250.

Depending on the trim the new SLK will get a V-6 or a four-cylinder engine. These engines will be mated to a six-speed manual or a 7G‑TRONIC PLUS transmission. The fuel economy has been considerably improved, while the top speed is limited as usual at 155 mph.