Titled Downton Abbey: The Grand Finale, the trailer features a title card that reads: "It's time to say goodbye," before Hugh Bonneville's Earl of Grantham can be seen patting the front of the manor house on the Grantham Estate.
A touching tribute is also paid to the late Dame Maggie Smith, with a photo of her character, the Dowager Countess, framed on the walls.
Returning alongside Bonneville, West and Dockery for the third instalment are Elizabeth McGovern, Michelle Dockery, Laura Carmichael, Jim Carter, Phyllis Logan, Robert James-Collier, Joanne Froggatt, Allen Leech, Penelope Wilton and Lesley Nicol.
Michael Fox, Raquel Cassidy, Brendan Coyle, Kevin Doyle, Harry Hadden-Paton, Sophie McShera and Douglas Reith will also be return, and they will joined by new additions including Paul Giamatti, Joely Richardson, Alessandro Nivola, Simon Russell Beale and Arty Froushan.
Giamatti recently told Entertainment Weekly of his role: "I do something quite important in this [movie]. I was like, wow, this is random, I have a lot to do with the end of this whole series.
"I do something of real significance – good or bad, I'm not going to say! But, I do something that makes a big difference to how everything ends."
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