The new musical REBECCA, which begins Previews on March 27 at the Broadhurst, annouced the cast that will be joining Sierra Boggess.  They are Tam Matu as Maxim de Winter, Karen Mason as Mrs. Danvers, James Barbour as Jack Favell, John Dossett as Frank Crawley, Donna English as Beatrice de Winter, and Nick Wyman as Giles.