I have seen the Scirocco-Version of LFS at the Games Convention in Leipzig (Germany) today! Looks nice and i hope to download it next time. I was surprised about the popularity of LFS there because there were a lot of options to play LFS.
Maybe for a car like the Sirocco there's a lot of driving aids (not needed for any car yet) that needed to be coded.
And since it's a real world car replica it have to match the real car performance more accuratly and it surely takes much more time than for a car that have no nothing to be compare to.