“Game of Thrones” fans will have to wait until 2019 for the planned final season of the award-winning medieval fantasy series, a gap of more than a year since the end of season seven. HBO said on Thursday that “Game of Thrones” would return in 2019 for a six-episode final season. It did not specify the month. The series is HBO’s biggest hit ever with some 30 million viewers in the United States alone and an army of devoted fans worldwide. The final season of the Emmy Award-winning show is expected to reveal which of the warring families in the fictional Seven Kingdoms of Westeros will win the multigenerational struggle for control of the Iron Throne. Production on the final season started in October.