From IGN
Warner Bros. brass were reportedly meeting today to determine how to sell The Dark Knight, both as a film and in terms of merchandising, in light of the recent death of one of the film's stars, Heath Ledger.
According to Slate.com, the studio still intends on releasing The Dark Knight as planned this July, but their sources claim that the studio might hire a voice actor to loop some of Ledger's dialogue as The Joker.
There's still a debate over whether Ledger was finished with post-production work on the film. As Slate points out, "the studio's denials would be understandable: Warner wouldn't want the public to be listening for variations in the voice when the movie is released."
The site claims that a voice actor will almost certainly provide The Joker's voice for theme park attractions and merchandising tie-ins. Warners is trying to determine how to sell products bearing Ledger's likeness as The Joker, which the actor gave his consent to, without appearing to be exploiting his death.
Slate also reports that the movie's marketing campaign was set to soon begin shifting focus away from The Joker even before Ledger's death. A source close to the project says the plan all along was to start with the Joker and then segue to the image of Aaron Eckhart as Two-Face.In the film, Two-Face is in a love triangle with Rachel Dawes, played by Maggie Gyllenhaal."