I had some real hope once that this game would eventually see the light of day. Sadly it’s been four years now since its announcement, and there hasn’t been any news of the games continued existence as a work in progress since 2016. Rumor has it that the licensing has run out on the project and the game will likely never be released because FOX is possibly looking to restart the Firefly universe with a new version of the series in 2020. I guess that is a faint hope to hold onto.
h/t to thezombiechimp.com for the info and the links. There are a lot more images of ingame content at that link.
This was the article that I ran across in 2013, archived on the Wayback Machine.