Wizarduniverse.com have posted an interview where Arron Eckhart confirms, we will get to meet Two-Face in ‘The Dark Knight’ movie.

Does Harvey get scarred in this movie or will we have to wait until the next one to see that?
Harvey Dent turns into Harvey Two-Face in this movie. So that answers your question better. [Laughs]

So there you have it. Quite happy about this. It’ll be nice seeing Two-Face done right rather than the Tommy Lee Jone’s hammy performance in Batman Forever. Question is, does that make Two-Face a larger villan in this movie than we first thought, or are they lining him up as lead baddie into the inevitable 3rd film? We’ll have to wait and see.