when is thing supposed to break ground. does anyone know?
Not any time soon - Concord still has a lot of units to move in the Parade, Panorama and even Luna buildings. I wouldn't expect any movement on this project for at least a year.
Re: Decking the tracks - not going to happen due to cost and the regulatory framework involved with the city and the railways - getting a small pedestrian bridge approved over the tracks ended up being a multi-year saga. There's just too many headaches involved for Concord to realistically take a stab at decking the railways.