"Just days after Lamborghini dropped its muscular 50th anniversary Aventador on us, our trusty spies have caught Lamborghini engineers at the ring testing what looks to be another new version of its Aventador supercar. Upon first glance this bright yellow Aventador appears to be stock, but a closer look reveals that this may very well be an early test car for the Aventador SV.
This Lambo is fitted with center-lock wheels, extremely low-profile high performance tires, and front brake calipers are mounted in a different position than the normal Aventador. A closer look at the front bumper reveals an additional aerodynamic piece, making for an even lower air splitter.
Moving to the rear, we can see an extra aerodynamic flap has been added to the spoiler for extra downforce, sometimes referred to as a Gurney flap.
Look out for more details around the Frankfurt Motor Show this fall."
Source: Teamspeed forum