So, I looked it up and found out something interesting. Unlike previous times, the official press car (pictured in this thread) had only one seat, so Mattel are right on the money. This is interesting, because every Challenge car is initially build with two seats and on previous presentations they all had both seats in.
The next thing I looked at were the wheels. I thought the rear were considerably different offset and Mattel's look like they are the same front and rear. Looking at pictures of that presentation car they might have a little difference, but not much.
So in the end, I have to say that I really tried to find where did they fail, because they always manage to mess up something on an otherwise great model. Well, I got nothing. It looks like they will come out with yet another great model. I am so totally getting one.