Revealed: 2012 Mercedes-Benz SLK Roadster

Just the Facts:

• The redesigned SLK-Class goes on sale this summer in the U.S.
• The roadster features new direct-injection four- and six-cylinder engines.
• Mercedes introduces a new panoramic "vario" roof that changes from light to dark at the touch of a button.

MONTVALE, New Jersey — Mercedes-Benz has pulled the covers off its redesigned 2012 SLK-Class, providing an early glimpse at the roadster's new styling — including an exotic panoramic "vario" roof that changes transparency — and new direct-injection engines. The 2012 SLK goes on sale this summer in the U.S.

The two-seater gets a new face that not only recalls classic Mercedes-Benz roadsters from the '50s, but also conjures a family resemblance with the current range-topping SLS AMG. While the new design is more aerodynamically efficient, it is the choice of roof treatments on the third-generation SLK that may intrigue potential buyers the most.

The automaker is offering three options: A standard body-colored retractable hardtop; an optional dark-tinted panoramic "vario" roof; and a new version of the vario roof that changes from light to dark transparency at the touch of a button — a feature that the Mercedes marketers have dubbed Magic Sky Control.

The SLK's cockpit has been revamped, too, with a choice of standard brushed-aluminum trim or optional dark brown walnut. Other features include a color display for infotainment functions and a flat-bottomed multifunction steering wheel. An intriguing option is "sun-reflecting" leather upholstery, which Mercedes says "noticeably reduces seat temperature" in the summer.

Initially, the car will be available in only one version, the SLK350, powered by a redesigned 3.5-liter V6 that makes 302 horsepower, accelerates from zero to 60 in 5.4 seconds and returns an average 23 mpg.

Later in the model year, Mercedes will introduce a new SLK250, fitted with a 1.8-liter four-cylinder engine rated at 201 hp and coupled with a six-speed manual transmission. Zero-to-60 acceleration takes 6.5 seconds, with a top speed of 155 mph and average fuel economy of 27 mpg.

The 2012 SLK comes with a new driver drowsiness-detection system called Attention Assist. Buyers can also order a Lighting package with cornering and adaptive lamps, as well as Distronic Plus with Pre-Safe Brake, which automatically applies the brakes in an impending rear-end collision.

Inside Line says: Some interesting new applications of advanced technology. — Paul Lienert, Correspondent