From what I understand, they are attempting to make a feature film with a script they've either been working on or is already completed. I think that is their number one priority, but have said that if the sales for the Season 3 DVD justify a Season 4 DVD, then they'll do it. I'm sure they will, since they wouldn't have done a Season 3 DVD unless the Season One/Two DVD did will, which it obviously did (hence, the Season 3 DVD...duh).
Anyways, I have to go now. Mother is getting angry...
"Take a swing at the copper...I wanna get things all loosey-goosey in here."