its downlaodable content, theres hundereds of cars missing including the one from the contest that that guy drew..
ill give you a list of TARGETED dates.. there was supose to be some in Oct. but i guess its not happening.. oh and 350 MS points per pack
http://www.ataricommunity.com/forums...d.php?t=536938
in game, the total amount of money required to buy them all is 6 million dollers