Zetsche's response was coy. Last year, the automaker announced that the future of Mercedes was all electric drivetrains. "Stay tuned," Zetsche teased. And then Schwarzenegger gave Zetsche a cowboy hat and the pair did a shot of schnapps.

Other new bits for the SUV? An all new rear camera system, with two sensors -- one above and one below the spare tire. The lower is 100 percent waterproof to accommodate the G's new 700mm (27.56 inches) wading depth. There's also a new infotainment system, which premieres in the A-Class sedan, with Car Play and potentially other configurations (a demo wasn't available).

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