According to Vulture, Rowling has shared extensive details about Professor Sybill Trelawney, thestrals, the Minister of Magic position, wizard and witch names, and  the Azkaban prison. Fans learned several details about the Harry Potter universe including Umbridge’s involvement with the Death Eaters in the last book, the men who have held the head position of the magical community’s government, and how the infamous penitentiary of the wizarding world was operated