I am expecting a setup similar to the one Jaguar are using on their new XF 3.0d S, a larger turbo complimenting the bottom end of the rev range with a smaller unit coming in a bit higher up the rev range to increase to power and maintain the torque levels. This would give excellence overtaking and everyday driving ability but would probably still not give anything like the throttle response or high end zing that is common in previous M engines.
I can't see it having more than 6 cylinders and more than 3.0L capacity, if it even has that much.
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