It’s the weekend before the 2012 Geneva Motor Show and as such, some presentations are to be expected but the reveal we’re about to tell you, wasn’t planned for today, at least not officially.

Somehow, the crew over at Czech website Autoforum got their hands on the Lamborghini’s surprise Swiss debut, which is none other than the Aventador J. Coincidentally, the Sant’Agata automaker published an official teaser video of a car describe/named as “#Unica” a few hours back.

From what we were able learn, the Aventador J isn’t a regular production model and should not be confused with the upcoming Aventador Roadster, spy pictures of which you can find here.

The Aventador J is an over-the-top speedster-like model that not only does away with the roof, but the windshield as well. Other modifications include an aggressive aero package that includes a front spoiler, side sills, rear diffuser and a rear wing, all finished in black that add an even more dramatic tone to the supercar’s design.

It is believed that Lamborghini has further reduced the car’s weight by stripping out the interior of any luxury amenities.

We still don’t know of the Aventador J uses the same 691bhp (700PS) 6.5-liter V12 as the regular model or if Lamborghini’s engineers have further honed the engine, but we guess it won’t be long before we find out.

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