I Just rang EB games (Electronic Boutique) and the main differences between the Black Edition compared to the normal Edition are:
Black Edition: comes with 2 extra cars and an extra DVD with comments, making of etc. Cost $79.00 AU ($58.20 US) ($33.80 UK) ($49.44 EUR)
Normal Edition: Obvioulsy doesnt have the extra cars or extra DVD. Cost $69.00 AU ($50.80 US) ($29.50 UK) ($43.20 EUR)
So this so called patch you are all discussing can not possibly be from the original Black Edition Version as the mentioned patch says '10' extra cars?
Therefore it must be some sort of Mod which is not even available to the Black Edition purchasers.