This is the official preview for the next season:
And these are two of my favorite other promo clips - the first includes great soundtrack (same song was used on the more recent Thomas Crown Affair) with the most amazing shot I've ever seen on television - a shot of a train reflected in a curve on a window, behind which is the protagonist Don Draper, whom we weren't sure if he was going to drive over the rails or not. It's so artful it looks like it belongs in film rather than tv. Check it out:
And then there's this, which captures the style, sexiness and mystery of the series:
Sunday nights at 10, starting July 27th on AMC. See more here.