...not gonna happen. "Serenity" is scheduled to hit the big screen in September. There's a 2-sequel option, so if the film does well, there will be more movies. If it doesn't do well (and it'll be interesting to see if Mr. Whedon can put 9 characters on the screen for two hours and make them immediately engaging to the general public), you can hope for a TV show.
So here's hoping for a movie franchise.