Not in a million years. I'm sure that BMW will make an F3X "M340d" using the newly announced 3.0L tri-turbo engine and place it under their M Performance label, but I will eat my own ass if the F8X M3 lineup is powered by anything other than good 'ol gasoline.
There have been a lot people posting "inside source" knowledge on the next M3 powerplant -- you guys can't be all right