Deviate: Yeah, Freespace II paved the way for another game which tried but didn't quite manage the same feel. Tachyon: The Fringe. But come on... Hail to the King, Baby...
Edit: Doh. BB codes didn't quite work out as I thought. Please add [i] to it?
I'm not sure where you got the notion that "Tacyhon" had anything to do with Freespace. Different developer, different publisher, different setting, different game engine...
...no whatsoever connection between the two franchises.
On that note, yes they tried to pave the way for a game: Freespace 3 that is.
But Volition was bought out by THQ, and Interplay went down the drain thanks to "enlightened" management, and the rights to Freespace 3 are in legal limbo.