Rowling added: "I always said that I would only revisit the wizarding world if I had an idea that I was really excited about and this is it."

Warner Bros also announced that it would serve as the worldwide TV distributor (excluding the UK) for the upcoming BBC TV adaptation of Rowling's recent adult novel The Casual Vacancy. It is expected to air in 2017.

More than 450 million copies of Rowling's seven Potter books have been sold worldwide.

She also wrote two small volumes, Fantastic Beasts and Where to Find Them and Quidditch Through the Ages - both named after Harry's schoolbooks within the novels. They were published in March 2001 in aid of Comic Relief.

Another Potter spin-off book, The Tales of Beedle the Bard, followed in December 2008.

The Harry Potter novels, about a boy wizard who survives the attack that kills his parents, became a worldwide phenomenon and were turned into eight blockbuster Warner Bros films starring Daniel Radcliffe.

The films have grossed more than $7.7bn (£4.8bn) to date worldwide at the box office, making Harry Potter the largest-grossing film franchise in history.

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