I'm not a fan of F10 mainly because the size/weight so i'll be skipping a generation. 4400lbs for performance car is not good. I don't care if they managed to hide the weight because laws of physics are there for a reason.
The next generation or G series M5 cannot come soon enough.
600hp and 400lbs less weight.. that will equal better hp/lb and will be much faster than F10. If we are to guess each 10lbs saved = 1 hp then you are talking about 40hp from drop in weight plus another 40hp from bump in power to 600hp and that is if it is not even more. That is 80hp right there more than the abomination that is F10.
What is the downside again? other than frying tires when you attempt to put down 600hp in rear wheels