The author of 'Heated Rivalry' is delaying the release of their next book due to worsening symptoms of Parkinson's disease. The book, which is reportedly titled 'Unrivaled' and is the seventh in the series, is now expected to be released in 2027. The exact details of the delay and the book's release are not universally agreed upon, but it is clear that the author's health is a factor in the postponement.