After months of speculation about a new Trader Joe’s at Travilah Square Shopping Center, the California-based grocer has signed on the dotted line. A 13,000-square-foot store will open in late 2017 or early 2018 at the intersection of Travilah and Darnestown roads. This is good news for North Potomac but bad news for Gaithersburg: A Trader Joe’s spokesman tells us the company will be closing its store on Contour Road in Montgomery Village on the same day the Travilah store opens. No need to worry about the other Rockville store at Federal Plaza: That location isn’t going anywhere. (Editor’s note: For an update on this story, click here.)