While it isn’t the high-performance Z4 M that we’re all waiting for, BMW is yet to even confirm such a car, this latest prototype spied at the Nurburgring confirms that there will be at least a Z4 with some distinct M styling cues.

The M Sport Package will include the typical exterior upgrades to give a sharper, sportier appearance, along with interior upgrades to enhance the driver-car interface. New pieces should include a BMW M shifter, M steering wheel and M footrest. Carbon fiber trim is also likely to be available.

In combination with the M Sports Package, customers will also likely have the choice of exclusive paintwork and wheel designs.

What’s not clear is whether or not engineers are also testing a range of new BMW Performance accessories designed for the latest 2010 Z4. Some previous accessories include minor power-up mods, beefier brakes, and transmission upgrades. It looks like we will have to wait until the new Z4 M Sport Package is released early next year.

Other models in the BMW fleet available with an M Sport Package include the 1, 3, 5, and 7-Series as well as the X5, which you can read about in our previous story.