Mercedes planning S-class convertible?

Mercedes-Benz plans to introduce a four-door convertible based on the S-Class luxury sedan, according to a published report. The V12 car will be unveiled at the Detroit auto show in January, Germany's Auto Motor und Sport reported Tuesday. The magazine didn't elaborate further on specifics of the car, but said it is inspired by the 1950s Mercedes 300 four-door convertible. If true, the rumor would represent the latest in a widespread model diversification effort at Mercedes. In recent years, the automaker has broken from its core vehicle lineup and expanded its offerings to contain countless niche vehicles. (See Auto Motor und Sport's rendering here, and an interesting two-door rendering by CWW Cardesign here.)