KATIE CASSIDY has been cast for the role of RUBY

07/12 - Katie Cassidy has been cast in the upcoming season of Supernatural, according to The Hollywood Reporter. In the third season premiere, fellow demon hunter Ruby (Cassidy) meets up with Dean and Sam Winchester (Jensen Ackles, Jared Padalecki) as they start wrangling the passel of demons that escaped from hell in the second season finale. Source: Zap2it

Supernatural episode 3.01 -  The Magnificent Seven

• The Seven demons are a result of the brothers opening the gate to hell in last year's finale. Tamara and Isaac, a married hunting duo, are aware of Dean and Sam's actions. Isaac initially refuses to work with them. Later, Tamara is taunted from beyond the grave. Ruby's appearance in the premiere is now confirmed.
• In a Supernatural twist of The Seven Deadly Sins, Bobby advises caution, but Sam disagrees. The demon Envy recognizes Dean by name. Two more hunters, Tamara and Isaac, help chase down the demons before realizing they're being hunted themselves. Dean tells them all to escape while they can while he tries to slow them down, showing an apparent death wish that angers his brother.
• More information is leaking about Bela and Ruby, the two new regulars. In the season premiere, the two tough women hunters find themselves working with and against Sam and Dean. Dean doesn't see much of a future for himself. Sam is wracked with guilt after killing two men to save Dean's life.

Supernatural Episode 3.02 - The Kids Are Alright

• I found this in the dean_sam LJ community:
  
  We see a mini version of Dean who's called Ben Braeden. He opens a present and sees cd's of AC/DC and gets thrilled *AC/DC RULES*. Dean is with Lisa and asks how old Ben is and she says eight.
  Lisa leaves Dean because her friend Donna is here.
  There are moms all around and gossip over Dean "Who's Dean? Like the best night of my life Dean'?"
  Dean eats a huge piece of cake and talks with Ben.
  In other scene, Dean checks a playground and meets Ben again. There are some tough kids who play Ben's Nintendo. Dean wants to help him but Ben tells him that 'Only bitches send a grown up'.
  There's a fight between the kids and Dean watches till Lisa arrives and gets her son.
  In other scene, we see Sam and Dean checking a construction house. They split and then we see Ben with his mother. In a reflection of the glass, Ben looks monstrous. Lisa is scared and five other strange kids appear. Ben says 'They don't want you to leave me'.
  
  Edit: "Sam and Dean hunt changlings targeting mothers and their children. Dean has a reunion with Lisa, a woman he once had a one-night stand with. Her son, Ben, strongly reminds Dean of himself. Though it makes him uncomfortable, Dean's natural instincts with children helps him get to know the boy, and watch with pride as Ben stands up to a bully. Meanwhile, other mothers admire Dean's... assets"

Filming starts July 16