BMW’s new generation 6 Series Convertible has been spotted in rural Pennsylvania, and its similarities to the BMW 6 Series Coupe Concept unveiled at the Paris Motor Show are there for all to see.

The new 6 Convertible features the shorter overhangs and wider fender flares than the current model, with dimensions that slot it nicely between the new 5 Series->ke317 and the 7 Series->ke323. The corona ring headlights seen in the new 6-Series Coupe are also retained for the Convertible. The taillights are smaller than the outgoing version and feature the L-shaped LEDs. Although first reports were claiming a hardtop 6 Series Cabrio, all the latest information we received thus far point towards a conventional soft top.

The new BMW->ke178 6 Series will feature a combination of diesel and petrol offerings. The top of the range diesel model will be the 640d, powered by the N57 turbocharged straight-6 common rail diesel engine outputting 306 horsepower. The 650i will be the highest offering powered by the 4.4 liter V8 Twin-turbo engine found in the other 50i models – until the new M6->ke208 of course. The first U.S. 2011 6 Series model will debut in March of next year in the form of BMW 650i Convertible.

UPDATE 11/05/2010: We finally have an official launch date for the next generation BMW 6-Series->ke320: March 26, 2011. BMW->ke178 UK has placed an invitation on their official web page for those who are interested in being the first to hear about the future convertible.

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