it is obviously a commercial reason why it is late, anyone who has worked for a big company will know it is near impossible to get signoff.
As the first commercial car maker car, in the game, there is obviously a fair amount of $$$ behind it.
Considering how many tracks/car's they have pumped out allready, I doubt it is for technical reasons.
Maybe the GFC has had something to do with it as well, payment for the inclusion from VW.