Believe It or Not postponed?

According to Slate.com, Burton's film, starring Jim Carrey as Robert Ripley, has been postponed due to script problems and the escalating budget. This is disappointing if it's true, but the same story says that Burton has been switched to directing the often-rumoured Sweeney Todd instead. So either way it seems like we'll have at least one Burton film to look forward to in the near future.