As much as I like the M3 GT2, I would rather see a Z4 based car, not unlike the Z4 GT3, in DTM. Or maybe even a 1 series. But they are going with the M3. It'll be interesting to see what form the car takes and how it differs from the GT2.
2008 Interlagos Blue E93 M3 - M-DCT
2011 Salsa Red Jetta TDI Sportwagen - DSG