Who will play Assange in Spielberg's movie?

  Fascinating news that Steven Spielberg has acquired the movie rights to the Guardian Wikileaks book.
  Spielberg is such a serious director, it's possible his movie might actually capture the substance of Wikileaks, and not be superficial, as, for example -- the Aaron Sorkin version of the Facebook story.
  This raises the question of who will play Julian Assange?
  I immediately thought of the guy who plays him on Saturday Night Live.
  I bet Jim Carrey will want the part.
  Who do you think Spielberg will go with?