Lamborghini Aventador LP700-4

Automakers try to keep upcoming models secret, meting out limited details on their own terms until the vehicle in question makes its debut. But the best laid plans of mice and men, wrote Steinbeck, often go awry. And in many cases, it's government agencies that can be held responsible, whether it's the vice-president leaking information or a patent offices releasing regulatory sketches.

In this case, it appears to be the Environmental Protection Agency and its fueleconomy.gov website, which has apparently let slip the arrival of the 2012 Lamborghini Aventador Roadster. The information in the EPA data sheet is roughly the same as the existing Aventador coupe's, but it's not these sorts of details that count here. After all, how many Lamborghini drivers are really that concerned with fuel economy or carbon emissions?

Now, this should come as no surprise, as we've been expecting the open-air Lambo to arrive at some point, particularly since its predecessors – the Murcielago and Diablo before it – offered convertible models. But this appears to be our first real confirmation.