The range topper is expected to borrow technology from the 918 Spyder.

Porsche is reportedly just getting started with the second-generation Panamera, with rumors pointing to a much faster range topper with a hybrid powertrain.The company has only confirmed technical details for the basic Panamera and the Turbo edition. Powered by a twin-turbo 4.0-liter V8 with 550 horsepower, the latter variant recently set a new Nurburgring record for production luxury sedans.

The Turbo S currently tops the range for the first-generation model. The 2017 edition is expected to deliver at least 580 horsepower, sources have told Motor Trend. If true, the redesigned Turbo S will only bring a 10-pony gain over the current model's 4.8-liter V8.

For the ultimate in four-door performance, the new 4.0-liter engine is said to be paired with hybrid tech borrowed from the 918 Spyder. Motor Trend suggests the electrified model will boast around 700 horsepower and 800 lb-ft of torque.

At the other end of the spectrum, the S Hybrid variant is expected to return with a supercharged V6. It will be toned down from the performance-focused hybrid, instead delivering impressive fuel efficiency.

Pending official confirmation from Porsche, launch timing and other details for the electrified Panamera sedans remains unclear.