We were supposed to see the 2012 BMW M5 in dealer showrooms this spring, but BMW isn’t done tuning their uber-sedan just yet. That’s fine with us, since BMW has a long history of sweating the details on their M cars, so we don’t mind waiting patiently for the new M5 to hit dealer showrooms by year end. When it does, we know it’ll lose the last generation’s V-10 engine in favor of a twin-turbo V-8, similar to the one used in the X5 M and X6 M. In the M5, you can expect a higher state of tune, and BMW Blog reports that the car will be rated at 578 horsepower and 530 foot-pounds of torque. It’s too early to know exactly what the performance specs will be, but BMW Blog speculates the 0 to 60 run will happen in just 4.4 seconds. Watch the pre-production M5 being put through the paces at BMW’s Miramas, France, test track in the video below.