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Well, so S55 (I6) is almost 100% sure. What is not known is the number of turbos and the displacement, if 3.0l or 3.2l, what is the maximum possible based on N55. The S55 may share parts with the "S20" an M reworked version based on the N20 making up to 350 PS. This is the engine to be found in the M2. All this sounds logic, as the M engines are based on AG engines what gives us all together three "true" BMW M engines, the V8, the I6 and the I4. This gives us an M6 making 560 PS, an M4 making about 450 PS and an M2 making about 340 PS.