Overlaying the Rail Implementation image from GeoOttawa, onto a BING Map image, I get the following:
I have sketched in the old Transitway path as well, for reference.
As you can see, the running trench was not wide enough for a station with side platforms. Therefore, there had to be rock removal to widen it. Also, since the train turns away from the Parkway, rock had to be removed in that direction. Where the Transitway veered north, a block wall was added to allow for back-filling.
I believe that the widened area is where the station house will be. What you are seeing is, basically, a Dow's Lake station duplicated to two tracks; but there will also be an upper-floor connection between the sides. This ‘bridge’ will provide the promised pedestrian/cycling pathway connection between the neighbourhoods on either side of the tracks.