Porsche is getting ready to launch an all-electric version of the Cayenne. That's a big deal, because the Cayenne is arguably the most important modern Porsche. It was the company's first SUV at the turn of the millennium, and it's still the standard-bearer for Porsche's SUV efforts. The Macan Electric may be good, but this is the king, and now it's electric, too—with an asterisk.
