Apparently Jed Whedon said there will be a Dr. Horrible Act IV
Also, the soundtrack will be available for download in a couple of weeks.
More updates over at Whedonesque from user deanna b:
Joss is older, and balder-slash-wiser than went they made Firefly. Any episode they make is a bonus, and any they can’t, he can put on the internet now. This was a model for a new way to put out things, that are for us and not so much for *certain other people*. He works with studio execs, but…
And Doctor Horrible is about putting power in other hands. The wrong hands,
Neil came up with the “shoulder dance” during Freeze Ray. He did the magic thing with his fingers when he was bored, and they decided to use that.
EDIT: They’re also going to have a contest. They’ll take video submissions for the Evil League of Evil. 3 minutes, like you’re applying to be on Survivor. 10 best on DVD.