Either our source on this story was having a bad day or Union Market’s expansion plans are even more ambitious than we thought. While the tip we got back in June about an impending Fort Greene location for the Park Slope gourmet grocer remains nothing more than speculation, there’s confirmation of expansion plans within the neighborhood. The sign above appeared recently at 402 Seventh Avenue between 12th and 13th Street indicating that the second branch will be opening this Fall. How psyched are South Slopers! Update: Evidently this isn’t quite as newsworthy as we thought. Both the Brooklyn Paper and the blog Five of Toast have already hit this. GMAP