BMW is expected to pull the cover off a production version of the all-new Z4 roadster during the upcoming Monterey Car Week later this month.  A Z4 concept  (pictured here) debuted last year in Monterey.  The new Z4 shares a platform with the upcoming Toyota Supra sports car, with turbo four and six-cylinder power options anticipated under the hood, though Toyota may opt for their own engines. The Z4 is expected to appear first at Weathertech Laguna Seca Raceway on August 23rd as part of the Rolex Monterey Motorsports Reunion, followed by stops at the Quail Lodge in Carmel and the Pebble Beach Concours concept lawn on the following days.