HBO has released teasers for two new series: 'A Knight of the Seven Kingdoms,' a prequel set 100 years before 'Game of Thrones', and the second season of 'The Last of Us.' 'A Knight of the Seven Kingdoms' will focus on the adventures of Ser Duncan the Tall and his squire Egg, with a premiere set for 2025. 'The Last of Us' Season 2 will feature new characters and continue the storyline from the first season, exploring the consequences of Joel's decisions. Both teasers were part of a broader preview showcasing HBO's upcoming content.