Yeah it would have been on a bonus disc or something by now. However, I don't know if it was on browncoats.com or some where else, but there is a rumor about a possible serenity II movie. Maybe just a rumor..
I can't think of the characters name but I really like that character who played the assassin that came after Malcom.
Anyway what started me to thinking about firefly is:
Are you guys excited that Morena Baccarin will be casted on the upcoming V remake?
She's suited for it.
As for a Serenity II, it won't happen. We can dream, but it won't happen.