Lamborghini is celebrating its past with the reimagined Countach and is about to unveil another new mystery retro-inspired supercar that could revive the original Countach LP500 prototype or the Miura for the 21st century. Looking ahead, Lamborghini is also preparing to replace the flagship Aventador supercar. The next-generation Aventador is expected to arrive next year, but testing appears to have already begun.

YouTube channel Varryx has spotted a mysterious prototype on the road that could be a test mule for the next-generation Aventador. From the front, the black prototype looks like a standard Lamborghini Aventador S, but the rear end has been extensively modified.

At the back, sections of the rear bumper have been removed, exposing the exhaust. Strangely, some parts of the rear bumper have been replaced with new components from another car painted in blue. It's a peculiar mash-up, to say the least.

Lamborghini could be testing new aero upgrades for an upcoming add-on for the current Aventador. This seems unlikely, though, since the current Aventador is reaching the end of its lifecycle after ten years. Lamborghini is giving the Aventador the ultimate send-off with the Ultimae, the Italian automaker's last-ever naturally aspirated supercar. Instead, we're most likely looking at an early test mule for the Aventador's replacement.

Little is known about the new Aventador, but we do know it will be powered by an all-new version of the Italian automaker's signature V12. To keep the V12 alive and reduce emissions, the next Aventador will inevitably get electrical assistance, but Lamborghini boss Stephan Winkelmann has made it clear it won't share the Sian's technology.

Sadly, Winkelmann didn't share any technical details, but with electrical assistance, it's safe to assume the next-generation Aventador will be even more absurdly powerful than the Ultimae, which generates 769 hp and 531 lb-ft from a 6.5-liter V12. As testing continues, we should see more prototypes out in the wild before the new Aventador debuts next year.