The NY Post suggests it could be Matt Lauer:
http://www.nypost.com/p/entertainment/tv/jeopardy_looking_at_lauer_as_next_XuTx94RwSSe3I4tM74WMtO
http://www.nypost.com/p/entertainment/tv/jeopardy_looking_at_lauer_as_next_XuTx94RwSSe3I4tM74WMtO