Snopes has an interesting article about the Hearst murder legend.
The Cat's Meow has some excellent casting. Edward Herrmann as Hearst, Kirsten Dunst as Marion Davies, Cary Elwes as Thomas Ince, and my favorite transvestite comedian, Eddie Izzard as Charlie Chaplin, who happened to be on the yacht, too.
It looks like a neat movie. Look for it in April.