Firefly Online, announced by Fox at SDCC, will be the closest thing to an official continuation of the 'verse Browncoats can get next year.

Developed by Sparkplug Games - the developers behind, ummm... Dairy Queen Tycoon - Firefly Online will see players create their very own Malcom-Reynolds-alike and Captain their own customisable ship, hiring a motley crew of (presumably incredibly witty and/or snarky) shipmates before heading out into the wild western frontiers of Space, trading with other players and going on missions.

The game is currently targeted for a Summer 2014 release.

[Polygon]