It's an Audi A4 - the Motorway networks are full of them. You can'd do more than 4 junctions of the M5 without being passed by 10 A4 2.0 TDI S-Lines (And to most people, all A4's are the same).
Now I'm not dissing the car at all - for reference I really like them and I'd place the 5 Series into exactly the same bracket (Nice but not a Ferrari) - but I just don't think its a jealousy fueled attack, it's pretty extreme, I just think there is more to it thats all. Perhaps the attacker knew the owner? I dunno, I'd just be suprised if it was completely random purely becuase he has a new A4 and the attacker didn't.
Irrespective of the reason it's still a bloody shame and I hope whoever did it is caught, but I guess nicking people for speeding is more important