Found it here. Eeee, Serenityyyy!
ETA: Also: Serenity Banner Pictures
I haven't read this because I'm afraid of spoilers, but other people might want it: A review of the Serenity script. [If someone else reads this, let me know if it's safe?]
A short article thing with Joss.
According to browncoats.com, the release date is April 22, 2005 [so I was right, Lis.] Which kind of sucks, because it means Lisa won't be able to come down for the premier, but oh well, I guess.
Uh. I think that's all I have. Heh.
[And yes, I love whedonesque, which is obviously where I get all of this from. Although serenitymovie.com and fireflyfans.net are also awesome. Now I'm really done.]
ETA2: Okay, so I lied. Joss speaks briefly about Serenity. It's cute.