Or rumors, anyway. According to All the Rage:
We’ve received word that the new Serenity miniseries from Dark Horse will be titled Better Days and will be set during the Firefly TV series. Why? Well, for starters, all of the characters were still around at that point in the time. It’s also said to explore some plotlines that weren’t used in the original series. As expected, Joss Whedon will be co-writing this one with Brett Matthews, his collaborator on the first Serenity mini. No word yet on the artist, but Adam Hughes is rumored to be doing the covers.
Dunno how reliable this is, but it’s fun to read about. Got this from whedonesque.