The (obvious) advantage of video when looking at prototypes like this is that we can actually see the vehicle in motion. That allows us to make a couple of educated guesses, particularly when it comes to the rumors about the next M5 moving to an all-wheel-drive setup. In the video, we can clearly see the next super-sedan throw its tail out around a bend. Judging by the way the driver takes the turn and the change in engine note, it looks and sounds like the driver was actively trying to throw the tail out. That could point to a rear-drive layout, or at the very least an AWD setup with a heavy rear-wheel bias.
Beyond seeing the M5 sliding about, we also get to hear its thumping, twin-turbo heart at work. It's widely expected BMW's popular 4.4-liter, twin-turbo V8 will carry on under the hood, and this video gives us absolutely zero reason to think otherwise. It sounds a lot like the current car, down to the abrupt upshifts of the seven-speed, dual-clutch transmission. According to the video's caption, that upgraded V8 should get around a 60-horsepower bump, which would put it around 620 hp. That's 20 ponies more than the 30th Anniversary car and would contradict a June 2015 report claiming that M was capping its cars at 600 hp.