We already know Lamborghini is planning a special car for its 50th anniversary this year, and which is set to be unveiled at the 2013 Geneva Motor Show on March 5.

Now, thanks to comments from Lamborghini design chief Filippo Prini, we also know that it will be the fastest model ever launched by the automaker.

Speaking with Drive, Prini said the car will be “a big surprise” and that Lamborghini hopes it will “shock” the automotive world once revealed.

That's quite the tall order, considering the new car will have to share the spotlight with Ferrari’s Enzo replacement as well as the production McLaren P1 in Geneva, and possibly something new from Pagani.

The good news is that it has a lot going for it. The new car is expected to be faster than the track-only Sesto Elemento, which can accelerate to 60 mph in just 2.5 seconds and reach a top speed in excess of 200 mph.

However, unlike the Sesto Elemento, it will be street legal.

It’s not clear yet how many examples Lamborghini will build, though as many as 10 units are possible.

It will most likely be based on the Aventador, just like the one-off Aventador J unveiled at last year’s Geneva show.

During the same interview, Lamborghini engineering chief Maurizio Reggiano explained that bespoke models were an important part of the automaker’s growth strategy. The cars are built at the special concept development center opened at Lamborghini’s headquarters in Sant'Agata Bolognese, Italy.