From the front, it really looks like mine. So I guess they assembled an E61 M5 but didn't go into detail (mirrors, side air-vents etc.) to confuse us a little bit. Too bad we can't have a look under the hood..
I havent seen any M sport pictures before (the first link only showed a sideview), so I didn't know the difference to the M5 was so obvious...
I also believe (as you pointed out), the M3 is going to look a bit different as well (air-outlets etc.)..