A little less than a year from going on sale, the new BMW M5 bahn-stormer was caught in the wilds of the California freeway system yesterday, wearing BMW's trademark camouflage wrap on just the tips of its go-fast aero bits. While we've already driven it, even we haven't seen it this naked. Until now. Shown as a concept at the Shanghai motor show last month, the next M5 will sport a twin-turbo V8 expected to be good for 578 horsepower and 530 pound-feet of torque — a spritely jump in output from the beloved V10 in the current M5. That force will be routed through a BMW 7-speed transmission and a limited-slip differential, allowing a 0-60mph time of just more than 4 seconds.