BMW is apparently very scared about the competition to their current M5 coming from Audi's all-new RS6 which was launched at the Frankfurt Motor Show.
Closer examination of the photos reveals additional mesh-covered air-intakes in the front bumper to satisfy the upgraded V10-engine under the bonnet.
Rumours suggest it is going to be pushed to no less than 425kW to match that of the RS6.
The current M5 delivers 373kW of power.
The photographer who delivered the spy-shots reports about a much more aggressive and somewhat lower sound and is sure to have heard the car was equipped with the new DSG transmission rather than the SMG used for M5s so far.
The upgrade M5 will probably be launched at next year's Geneva Motor Show.