Jed Whedon talks to the LA Times about Dr Horrible’s Sing-Along Blog

Q. There’s been talk of a sequel. How far along is the planning for it, if at all?

JW: We have some songs, a rough outline, and no time. Though I have a feeling that when Joss is finished making his massive, expensive superhero movie, he will want nothing more than to make a tiny, cheap superhero movie. With songs.

Q: We’ve seen some of the other villains in the “Dr. Horrible” universe — well, a quick scene — would it be possible to see other heroes in a sequel?

JW: At the risk of spoiling — yes.  There will be other heroes in the sequel.  Perhaps even a council of them.  A Council of Champions, if you will.