I don't expect the WWE to release very many Superstars this year. If anything, I only look for the likes of Ezekiel Jackson, Mason Ryan, JTG, Ted DiBiase, and maybe Curt Hawkins to get released as well as several Divas (expect outside interests to be the reason for potentially released Divas).
But keep in mind, there's almost always a surprise release and my pick is Cody Rhodes. Rhodes has recently been jobbing to the likes of John Cena, The Miz, Alberto Del Rio, Sheamus, and even Brodus Clay. With the WWE having so many credible heels on the roster, I think that Rhodes would be very expendable. The only thing which could prevent the WWE from releasing Rhodes is his father, WWE Hall of Famer Dusty Rhodes.