For fans of “Downton Abbey,” it feels like decades since we last saw the Crawley family, and it’s still another long, Lady Mary-less four months until the costume drama returns to PBS in January. Luckily, the show’s producers are, like Lord Grantham, doling out tips on Christmas morning, unusually generous with information about the season ahead. We’ve already seen preview clips hinting at tension between the formidable dowager countess, played by Maggie Smith, and Lady Cora’s American mother, Martha Levinson, played by Shirley MacLaine.
On Monday, “Masterpiece” released a full-length, mildly spoilery trailer that should keep zinger-deprived “Downton” fans going for at least a few weeks more. Here’s what we can expect from Season 3, based on repeat viewings of the 1-minute, 15-second clip.