I remain very skeptical they will go this direction. The last thing these cars need is more weight.
Now, I would not be surprised to see a M5 GT and M3 GT with AWD in the future. However, for M coupes and sedans, I really doubt it.
2008 Interlagos Blue E93 M3 - M-DCT
2011 Salsa Red Jetta TDI Sportwagen - DSG