Via Oh No They Didn't, via some other site:
Warner Bros wants Sweeney Todd: The Demon Barber of Fleet Street director Tim Burton to “butcher” his own film, according to a report from the Daily Mail. Apparently the early footage from the film was so extremely bloody that the studio executives have become a tad squeamish and are requesting the film to be re-cut. In its present form the film would merit an R-Rating, but Warner Brothers would prefer it to be released with a PG-13 MPAA tag.
Sweeney? PG-13? HEADDESK.