There are a few articles out there about the possible renewal of the 5th season of Supernatural.
Supernatural (The CW)
The audiences are slightly smaller, but come on, The CW has no other show besides "Smallville" -- and that includes "90210" -- that gets the buzz "Supernatural" does. Hunky actors, strong stories, and loyal viewers all translate to what should be at least another year of life for this show.
Of course, who knows what the future will bring. Networks have a way of throwing logic out the window sometimes, and even changing their mind. While this is a bit of a snapshot on where those executives are right now on these different shows, we're just a little more than halfway through the season, and a lot can happen."
Source: E!Online also has an article about it:
"According to Ostroff, "We've been creatively really happy with the show. The show's been holding its own. I hope it continues to do well because I'd love to see it back."
Predicted Response to Supernatural Cancellation: 10 on the fan Richter scale
Chances of Renewal: Excellent. By all accounts this is the most compelling season yet. The ratings are rising accordingly, and creator Eric Kripke had always planned a five-season arc. Shutting down SPN now would just be, well, evil."