In a video message, Catherine said she would return to more of her duties, a positive development, but many questions remain about her condition and treatment.

Catherine, Princess of Wales, has said she has completed her chemotherapy and is “doing what I can to stay cancer free,” as she plans to return gradually to public life in the coming months.

A slick video by Catherine, Princess of Wales announcing that her chemotherapy has finished marks a dramatic shift in communications for the British royal family, media and commentators said Tuesday.