I think TRB and some concept art is about as far as Taldren went on SFC GAW before Activision bought out the franchise. I think they put everything they developed into OP and released it while they still had the rights. That would Also explain why OP was released with so many bugs. Anybody wonder why so many are bitter about SFC3? Still, if SFC3 were done better, I wouldn't have been so angry. Recently, Paramount has been moving on doing something with ST gaming, so new developments are likely. Either someone will get the rights to develop a new SFC or maybe, just maybe, SFC will be declared "dead," and the source code will be made available.
They really need to re-release SFC OP so more people can get in on it!