From Wired:
Like Capt. Mal Reynolds stumbling in after a bar fight, the short-lived but much beloved sci-fi series Firefly will soon make an unexpected return, not as a TV show, but as a massively multiplayer online game.
Now that's shiny.
Multiverse, maker of a free MMO-creation platform, plans to announce Friday morning that it's struck a deal with Fox Licensing to turn the show into an MMORPG in the fashion of Star Wars Galaxies or Eve Online.
The "Browncoats," as Firefly's most devoted fans are known, have been campaigning to bring the show back almost since the moment it was canceled in late 2002. Now they'll get their wish, albeit in a new form.
The rest of the article can be found here.
I've not found any newer news on this so it may be vapor at this point. If done correctly this could be a very interesting setting for a MMO. I expect that you'd see the standard Sci-Fi character classes and maybe even some Psychic powers for those wanting to be mage types.
One may even wonder if there are plans to use the ruleset from the Serenity RPG produced by Margaret Weis Productions, Ltd. Serenity Wiki