The Pens recalled Kris Letang from Wilkes-Barre. He fills the obvious need of a right-handed shot from the blue line. He's not here to sit, so I'd expect that we'll see either Scuderi or Sydor sit down (unless there's an injury we don't know about).
The two players sent to Wilkes-Barre were Alain Nasreddine and Tyler Kennedy. With the games that Ruutu and Laraque played against the Devils, Kennedy is probably not needed. Nasreddine just couldn't get any playing time. He has to clear waivers, but I don't think that will be an issue.