He's definitely dead. He was sitting on top of the huge pile of money burned by The Joker.Because I am also assuming now Liu is dead.
Tried to resolve the numbers of Two Face's killing spree in second viewing. It still doesn't really make much sense. The first viewing, I only thought he killed 2 people.
1: He is shown killing Wuertz
2: He is shown killing Maroni's driver
3: The seat belt is a device to show Maroni probably dies in the crash
4: Ramirez. Either he lied about the coin toss (maybe someone who actually saw the coin can correct me), or reflipped. Since she is responsible for Rachel, there is no way he was going to leave without killing her. "Live to fight another day". By punching her, could basically be starting a new fight with her (a stretch). But, Gordon did say Dent killed two cops. These are the two cops Dent defames at the beginning of the movie. It has to be Wuertz AND Ramirez no matter how it went down with her. Plus, if she lived the whole cover story would fall apart.
5: Can't figure it out.
Perhaps we will find out with the DVD release. The answer might lie in cut scenes.