SF Examiner mentions that Muni is (finally) planning on
constructing the turnaround for the T-Third/Central Subway around the block of 18th, Illinois and 19th, possibly extending that to 20th to reach the Pier 70 development.
construction possibly beginning early next year, finished by year's end, which actually probably means starting sometime next year, finishing in 2015.
aside from greater frequency on some parts of the line, it would mean the N-Judah could be extended into MB from its current terminus at the Caltrain station.