Rowling talks about a possible future for the series and about how she coped with the fame that came with Harry Potter's popularity.
The books spawned a movie franchise and theme park. More than 400 million copies of the books starring the boy wizard have been sold worldwide.
Forbes magazine has ranked Rowling as one of the richest women in Britain, with an estimated wealth of $1 billion.
The interview will air Friday on ABC at 3 p.m.
The Associated Press contributed to this story.
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