I am not so sure its Licensing , as VW is owned by VAG, which also owns just naming a few, Audi and Lamborghini , Seat, Skoda, and we have seen Revell /AG do the Audi R8 , Aoshima/Fujimi with their Lamborghini kits, Fujimi/Tamiya with their Porsche kits, Bellkits are currently doing a VW Polo, and they also have Skoda kits, and those are License kits.
I really have no idea how the VAG handles their licensing.