We hope you haven't got your heart set on a Doctor Horrible sequel for Christmas, because, well, it sounds as if one isn't going to happen anytime soon - according to the Evil Doctor himself.
Talking to Sci Fi Wire, Neil Patrick Harris' disappointment about that fact rivaled even your own:
Oh, God, I wish I could say there was going to be a Dr. Horrible sequel, but I know there's so many people involved in the creation of it that have a lot of other stuff going on right now... Mainly, Joss [is doing] Dollhouse, and he has another movie, Cabin in the Woods, that he's doing at the same time. So I don't know that anything would happen soon. But everyone has been super-enthusiastic about it, and I think that means that hopefully something will come.
That hasn't stopped Harris from wanting to work with Whedon on something else, however:
I'm in CBS' corner right now because of How I Met Your Mother, so I don't know that I'd be able to [appear on Dollhouse], but I think it's produced by 20th Century Fox, so, you know, they're sort of cousins... That would be fun! All right. I'll ask Joss! I like being a cousin in the Whedon family, so, whatever he wants me to do. Except porn.
Wait, the Whedon family makes porn together? I'm not sure how I feel about knowing that.
Harris Eager For Horrible 2, Dollhouse [Sci Fi Wire]