TV Guide just published an interview with Joss Whedon today, and there was mention of Dominic:

Will Reed Diamond be back or is his character Dominic staying in the “attic”?
We’re committed to seeing him again, but we’re not going to pull him out of the attic right away. As is the case with a lot of other actors, they’re either busy or we can’t afford to have them as much as want. And we have a large cast to service anyway. So it won’t be right away.

Will we get to see that damned attic?
We may just have a visit.

There was also a great mention regarding Adelle:

Adelle doesn’t run everything, does she?
She may not be the boss of everyone but she’s definitely the scariest person in the room. And we get to see some of that. Everybody else in the House is afraid of Adelle. There’s a reason for that.

Is she a Doll?
I ain’t saying.

The full interview is here.

I can't wait for season 2! Is it September 25th yet? ....How about now?