Just in from Hollywood Elsewhere [1]:

How will Warner Bros. and the Dark Knight team handle Heath Ledger’s unrecorded looping sessions? Slate’s Kim Masters is reporting [2] that “it would be unusual for director Chris Nolan to have all the sound that he wants at this early stage [for a film coming out in July], and that on a big-budget franchise picture like The Dark Knight, a producer opines, “looping would be the norm.”

The obvious solution would be to use a voice artist “and there are rumors that the studio will do that,” Masters writes [3]. “If so, 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. But the producer assures: ‘With a good voice artist, you would never know the difference.’”