If it does end up with a 3 turbo setup, it will most likely be a compound setup with 2 small turbos/3 cylinders for the low end (like the N54) and the exhaust from both of those drives a larger turbo for the high end. The charge air would feed from the filter to the big turbo then split to the smaller turbos to get boosted once more before running through the intercooler. A compound turbo setup would be a perfect fit for an M car, even though it would be a further diversion from heritage. You get the throttle response of tiny turbos, and all the grunt of a big turbo, with none of the down sides of either.
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