Over on Ausiello's site you heard, exclusively, that this season might, maybe, perhaps, possibly be 's last season. Or it might, maybe, perhaps, possibly not be.
And sure, show's creator Eric Kripke can't shed any light on it, but you can't really expect him to say, "Well, if the ratings are good, and they are willing to pay us well, and secure the cast, of course the show will be back!"
I'll grant that the headline of "Exec doesn't know if show will return for sixth season" is not as interesting, but the only "truth" in Ausiello's post is that. Kripke doesn't know. And you already knew that!