The new Mercedes S-Class already offers a multitude of powertrain options varying from inline-sixes to the mighty V12 reserved for the extra-long version. The Benz and Maybach models will soon be joined by an AMG, which will be carrying the E-Performance branding as part of the company’s lineup of electrified performance cars.

A thinly covered prototype of the S63e (name not confirmed yet) has now been spotted by our spies, revealing its plug-in hybrid nature by flaunting fuel caps on both rear fenders.
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