"Through war and peace Downton still stands," MacLaine's character, Martha Levinson, says in the promo, "And the Crawleys are still in it."
From the looks of the trailer, Downton fans can expect the usual Dowager Countess zingers, Crawley family money troubles and a not-so-happily ever after for Matthew and Mary.
British viewers will be able to tune in to the third season premiere when it airs on ITV in September. Americans will have to wait until January 2013.
Boston schools pull out free condoms over wrapping complaints
NBC reportedly holds celebs hostage to Jimmy Fallon's show