Well, it's time you've stopped. Two-Face is officially dead, according to the novel, movie, director, and now the actor. I think it sucks because it would have been cool to see Two-Face emerge as a crime boss leading the Arkham escapees to destroy the justice system. Still, the Harvey Dent arc in Dark Knight was fantastic, and now we'll have another clean slate for the third movie. Here's the quote from Aaron Eckhart.
"He is dead as a door nail. He ain't coming back baby!" "I asked Chris [Nolan] that question and he goes, "You're dead" before I could even get the question out of my mouth. 'Hey Chris, am I?' 'You're dead!' 'Alright, cool.'"
But since Chris Nolan hasn't signed on for the last movie, he could write whatever story he feels like writing. If he wanted to bring back Dent, he certainly could, and to the delight of fans. As long as he doesn't cast Johnny Depp, all systems are go for the Riddler movie.