Are there any technical barriers that hinder the conversion of tracks from (e.g.) rFactor to LFS ? I've seen a "Norschleife-conversion" for GTR2 which was very impressive !
What he meant was, it is possible to get a McLaren F1 into LFS, so it's also possible to get a new track. The point is, even if some semi-god-like genius like Kegetys hacks it into the game, it won't work online, and would thus be useless.
Maybe there will be an track editor released around/after S3, then we could maybe see some conversions. But if you want one within the next two, probably three years, you're out of luck.