Well, I am bored out of my mind, so I feel like writing.
Why I believe Harvey Dent is scarred by acid during Salvatore Maroni's trial: An essay
I am well aware of the two scenes in the trailer that make it appear that Harvey Dent is possibly scarred by gasoline/fire. However, I do not believe this will be the case, for several reasons.
numero one: The casting sides (part 1). Based on the prologue alone, as well as from some spy reports, it seems that the casting sides (which are most likely from an early draft of the script) seem to be a fairly accurate description of the scenes we will see in TDK. There is one side in particular that seems to be the build up of Dent's scarring.
number duos: the casting sides (part 2). All of the casting that correlates to this scene was made. We have Dent, we have Maroni, Al Rossi, the Gotham Judge, and Court Bailiff.
three: Based on spy reports, we know that there is indeed a courtroom scene in TDK. It has been confirmed to me that it is indeed Maroni's trial, and 5 of his henchmen will be present in the audience, with "crazy scars" on their faces. The scene was also described to me as "chaotic." I don't know what else it would be other that Dent being scarred.
number 4: Interviews. I am too lazy to find them right now, but Eric Roberts has said in an interview that they are basically sticking with the comics in terms of Dent's scarring. Aaron Eckhart has also stated numerous times that Dent is scarred by acid.
The end.