Could this be the Lamborghini Gallardo LP560-4 Superleggera? The "regular" Gallardo Superleggera was cancelled last year, but these shots caught by Autogespot fuels rumours a new iteration could be on the way.
The very lightweight model could keep Lamborghini to its commitment of introducing a new model at every big-time auto show in the near future; a difficult task, considering the state of the global economy.
A Superleggera model of the Gallardo came near the end of that car's life-cycle, just a year before the introduction of the Gallardo LP 560-4. It had 520 horsepower 10 hp more than the "base model," while weighing 100 kg less.
If the car does not exist, we can certainly dream of a Lamborghini LP 560-4 Superleggera.