Not yet, but http://whedonesque.com will probably be the first to post any hints of a decision. Creator Joss Whedon has stated fairly recently that sequels are neither a sure thing, nor a lost cause. (And I'd personally rather see Fox sell the TV rights, and get a new series--more hours and more stories! Unlikely, I know. The effects were costly on a TV budget.)Mr. Anderson said:so any word yet on whether or not there will be any more movies in the series?
But the movie didn't lose money yet... it's still MAKING money (it only just opened in some countries, and in the US it is now in "dollar theaters"), and more importantly, like other movies, it's likely to make far more in DVD sales/rentals (it's coming to DVD in the US just prior to Christmas).
In the past, other movies that relied on DVD sales before they turned a profit have gotten sequels. So the in-theaters dollar amount alone is not the deciding factor. And Universal has said there is no particular dollar threshold--it's a more complicated decision to be made. Plus, Serenity came in under budget, and then opened quite well for a sci-fi movie--not to mention the great reviews--so by many measures it has been a success already. It just didn't have the "star power" to draw in blockbuster crowds on day one.
And don't forget, Joss Whedon has a long history of "doing the impossible" when it comes to getting his vision out to the world. Getting his Buffy vision on TV for 7 years, after the movie concept was taken from him and butchered? Unheard of. Firefly on DVD? Firefly marathons on Sci Fi? A Firefly MOVIE? With the entire original cast and the entire 200 foot ship re-built from scratch? These are all near miracles for a quickly-axed TV show that can't easily be described in a marketing sound bite. And nearly everyone who sees Firefly and Serenity loves them, so I'm optimistic about another miracle on the way.
I don't think we'll know any time soon, though.
(PS, spoiler discussion of the movie here: https://forums.macrumors.com/threads/152189/ )