Catherine revealed during a TV interview that she has been thinking of portraying Cleopatra in a musical film. The idea initially was to make it into a film, but then producers felt it would be more successful if the idea was formed into a Broadway play. Taylor also famously played Cleopatra in the epic 1963 movie. 
After finishing movie, 'Rock of Ages', with Tom Cruise and Alec Baldwin , the Welsh beauty is keen to get back to Broadway. She was Oscar winning for her role singing and dancing in the film 'Chicago' so perhaps it won't be such a change for her after all.