Speculation is that the drop-top companion to the Revent?n coupe will feature a 641-horsepower 6.5-liter V12 driving all four wheels through Lambo's six-speed e-gear transmission, with 0-60-mph acceleration in less than 3.4 seconds and a top speed in excess of 200 mph. Also rumored are carbon fiber body panels, 18-inch wheels and tires and a cockpit trimmed in carbon fiber, leather and Alcantara. According to Worldcarfans, production likely will be held to 20 units, with prices expected to start at about $1.75 million. Lamborghini Reventon Roadster @ 2009 Frankfurt Auto Show: http://www.edmunds.com/insideline/autoshows/frankfurt/2009/lamborghinireventonroadsterleaked.html