We have just filmed the replacement of the BMW 3-Series Convertible while the brand’s engineers were driving a camouflaged prototype on the Nürburgring track.

BMW is rumored to replace the 3-Series badge with the 4-series moniker for the two-door coupe and convertible variants of its newly revealed 3-series sedan, in much the same way that it does with the larger 5-Series (sedan, Touring and GT) and 6-Series (Coupe and Convertible) models.

The convertible variant, which is also referred to by its internal codename F33, will retain the retractable metal top as well as the four seat layout of the current 3-series Cabrio.

The engine range will mirror that of the 3-Series saloon offering buyers a choice of turbocharged four-cylinder and straight-six gasoline units as well as a selection of inline-four diesels for Europe and other markets.

After it goes on sale in late 2013 or early 2014, BMW will eventually enhance the range with an M4 variant, likely sporting a turbocharged inline-six.

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