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I also think it's unlikely based on the leaks/spy photos but from an R&D and production point of view I don't see any problem. BMW has mutilated an M5 engine before to create the M3 engine and the component sharing between all of the M engines ( M3, M4, M5, X6M, X5M, M6, M6GC ) could potentially save more in the long run than re-using the tools for the N55 block and then use all M3 specific components. It's not as clear cut from a cost planning perspective as it can look from a glance. And a V6 is more compact leaving more space for trciked out multi turbo setups. I'd put it at 60 (I6)/40(V6) at this point. I was at 90/10 but I'm starting to wobble on that.
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