60 Seconds Of Promo For The Final Season Of DOWNTON ABBEY!! Read the full article on AICN I am – Hercules!! While Americans have to wait till Jan. 3 to learn what 1925 holds for Charles Carson, Daisy Mason, Mary Crawley and the Dowager Countess of Grantham, all the dirty foreigners in Britain get to see the launch of “Downton Abbey’s” final season starting Sept.