Some updates.
These pics were taken just now near the yellow dot on the map. The green area is the park. The grayish area is the extended area of the park. This map may not be accurate, just a pic I got from the internet.
These pics were taken facing east, towards the park area. You can see on the blue door frame thing that they are changing the course of the Empress Xiao river, probably according to the park design. I think you can see the river bed in the pic, it's wider than the old/current river -- more curvy. The green fabric is to reduce smog. You can see we have some smog today.
These pics were taken facing west. There's some new demolition. I think there used to be some buildings several stories high, now they are gone exposing a factory behind them. By the way, the dog market should be somewhere in this direction (west). It's one among many demolitions and relocations, not just for the park. I think I mentioned in a previous post, the whole tongzhou district got upgraded into the 2nd center of Beijing and the industries that doesn't fit the new purpose (pollution, labor intensive etc) are all being relocated.
There's not much in the pics because most of the area are enclosed with walls blocking the view now, and they are still doing groundwork.