At Comic-Con it was announced that the original cast will reprise their roles for the upcoming Firefly Online game. The game is looking a lot more of a reality now than it might of when it was first announced.
Firefly Online is based on the fox canceled TV series that fans have fallen in love with, but too late to save it. Still the fans supported it well enough that a movie got made to tie up the loose ends of the single season of episodes.
If you want to check it out you can have a look here.