What’s hiding beneath this mystery BMW M8 mule?

Spy photos of a mystery BMW M8 mule being tested at the Nürburgring could be our first glance at BMW’s rumored 600-horsepower plug-in hybrid. The demise of BMW’s mid-engine i8 plug-in hybrid with no news of a direct replacement led us to wonder what BMW really has in store for the future of the formula, but if this early prototype is anything to go on, it may be alive and well.