Aaron Eckhart is "Two Faced"

Aaron Eckhart who will be playing DA Harvey Dent in the upcoming "Dark Knight" movie revealed that Dent's alter ego "Two Face" will also be in the flick.
EntertainmentWise :
Now Eckhart has told MTV: “I play Harvey Dent. Harvey Two-Face. They are both in the movie”.
This essentially confirms the villain’s appearance, but to what extent the villainous side of Dent is involved remains to be seen.