Currently only a rumour but quite possible is that the head terrorist for the upcoming Live Free or Die Hard is to be played by Jeffrey Wright (Syriana, The Manchurian Candidate).
Fox chairman Tom Rothman recently said that the films villain would be announced within a couple of weeks, so we should find out if this rumour is true or not, very soon.

Jeffrey Wright can next be seen in the upcoming Bond movie Casino Royal, premiering November 17th in the U.S and December 7th in Australia.