Straight from San Diego Comic Con comes the latest story based trailer from Middle-earth: Shadow of Mordor and it’s quite revealing about the identity of the Wraith.
The Wraith bound to Talion has a story to tell too and it turns out he is the greatest Elven Smith of the Second Age, Celebrimbor. Once upon a time he was conned by the evil Sauron into forging the Rings of Power with him, only to be betrayed afterwards. The fact he and his family were then murdered seems to be the main connection that ties him and Talion together in the pursuit of the Dark Lord.