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Just wanted to post some added info since there were so many responses
It said to have the new m5 engine(not the current m5. It is most likly to be called the new z6. Z6 will share new 5-Series 42 Volt electrical system & inside likely to have a central control unit, which will allow the driver to alter audio, climate, navigation & other vehicle functions, using a single joystick & LCD screen.