No it's not realeased yet, but screenshots of the vehicles and the new city (yes, I said new city) have been released at xbox.com but for those of yos too lasy to go find them here they are.
Ferrari 288 GTO
Ferrari 250 TR
BMW 645Ci
Porsche 356A Speedster
BMW M3 CSL
Chevrolet Corvette C6
and theres also this car
Ferrari 365 GTB/4 (there was no in-game shot of this car)
and the city in those pictures is Paris.
and heres the link to the xbox website featuring the DLC. It does say on the website it is released but it is not.
http://www.xbox.com/en-gb/live/downloads/
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