STILL MORE SPOILERS FOR SEASON 4.
An interview from Kristin from E! Excerpts/snippets, under the cut. They're pretty old, but just in case!
Source
On Season 4 and Mary Winchester:
In terms of Mary, we're definitely delving into all of that. I think my goal is to answer those questions sooner than people are expecting us to. I think in the first half of season four we'll actually answer a lot of those questions.
Croatoan virus on the mythology arc!
We have the Croatoan virus on our board of ongoing mythology, and it will return in some form or another that we're working on.
IMO, as the fan who asks the question on the said interview also says, it seems that there's something significant about hte results of the Croatoan virus and Sam's demonic prowess.
Yep. It's pretty old news. Excerpts relevant to the rest of S4 lifted instead. :D
Source
On Season 4 and Mary Winchester:
In terms of Mary, we're definitely delving into all of that. I think my goal is to answer those questions sooner than people are expecting us to. I think in the first half of season four we'll actually answer a lot of those questions.
Croatoan virus on the mythology arc!
We have the Croatoan virus on our board of ongoing mythology, and it will return in some form or another that we're working on.
IMO, as the fan who asks the question on the said interview also says, it seems that there's something significant about hte results of the Croatoan virus and Sam's demonic prowess.
Yep. It's pretty old news. Excerpts relevant to the rest of S4 lifted instead. :D