I’m really looking forward to seeing it, myself. My son and I love the Firefly series on DVD and enjoy the other Joss Whedon television series (Buffy, Angel).
It seems as though the movie is already rated 8.4/10 at IMDB (3,161 votes). For some perspective, if it could maintain that average among regular voters, that would put it among the top rated 46 US films of all time.
Here’s to it living up to my expectations, and that we get either a nice stream of sequels, or a rebirth of the television series (or both!).
UPDATE: Ok. I’ve seen the movie and loved it. Everybody who thinks they might like it should definitely go see it. Lots of great action and humor. I think it helps if you are familiar with the show, but it’s not necessary to get a lot out of it.