There has been no mention of adding multi link suspension into LFS.
Not saying it isn't or is, I don't know but all that is mentioned is the scirocco car. Any parts or specifics that car has and the probability of seeing those in LFS are all speculation until official statement is made.
As for the progress of the scirocco I really hope the devs keep working until its properly done. Even if the car doesn't interest me the slightest I'd still like to see it done properly and not released until it's done. I really hope the devs have the guts to postpone the release if it is clear that the quality is not enough for christmas release. Like the sound patch that was released way early and unfinished. Not saying that the devs should work through christmas, releasing it when it's done is ok even if it means february/april.