Game of Thrones ended with...mixed reviews to put it lightly. Let's face it, most people were not happy with the final episode, but creators are now trying to make up for it. Don't look now, but there's news that another Game of Thrones prequel is in development at HBO. The second prequel,Tales of Dunk and Egg, is now in development and will be based on the three novels under the franchise.
If you're a true GOT fan you know that there were several prequels in development, but subsequently scrapped. One, House of the Dragon, did get a green light and will be released later.