Thanks! I guess I've come to realize an incorrect assumption on my part. Given the big ridership projections, I had assumed a nice, big station box under much of the rails and platforms in this image. You know, a place to wait for transit, get out of the weather, maybe buy something or have a bite to eat.
But, from the construction site pictures, it looks like a fair amount of the works will be sitting on the berm in the final version. A small-ish station box looks likely on the east or west (or both?) sides of Broadview. As for Eastern Ave, there is no apparent station box yet. Rather, it looks like a person could take stairs directly up to the GO platforms, or use the hallway-type thing tacked onto the north side of the berm between Eastern and Broadview to access the Ontario Line.
But maybe I'm still misunderstanding the plans?
Guess I had been hoping for an urban style of train station, with interior space big enough for activities and place-making.