Early July is too early. The vp of Concord Adex said at the Railway lands meeting last week that it would be open around Nov. He might have even said later but I don't remember exactly. It's not opening before occupancy begins for Montage/Neo.
Also, the park will begin construction soon and might be finished by the end of the year, but definitely by this time next year. they are still working on the final details with Douglas Coupland, the engineers and all the other players involved. it will have a artificial playing surface instead of grass in one of the sections designated for soccer. Reason being to make better use of the surface for a longer period of time throughtout the year. More details of the park were mentioned but I forgot the exact details.
And yes, the pedestrian bridge to Portland St. is getting built. An agreement was made with GO to allow a bridge with a support column halfway across the tracks. All the people involved (City, GO, Concord, etc.) all gathered in Adam Vaughan's office and Vaughan laid it out and got an agreement. GO's concerns were the height of the bridge over the tracks and construction issues. GO needs the bridge to be high enough above the tracks for when some of the tracks are electrified there is enough space for the wires, poles, conductors, etc. This would put the end of the bridge about 5 feet above street level at Front and Portland so a bit of engineering would be needed somewhere. Both Vaughan and the Concord VP said the bridge will be well designed architecturally and should begin construction when GO begins work on adding a third flyover track. Should be within the year when work begins.