Once question is whether there will be separate station houses for each platform or will there be one station house on the former railway station site on De Grassi and a tunnel through the embankment or overhead over the tracks to the eastbound platform. That would eliminate the need for a station house next to the Jimmie Simpson Rec Centre.
As for egress, gated emergency exits have a small footprint.
My guess is that there will not be any access to the south side of Queen from the platforms due to encroachment onto the playground. Passengers would have to exit the station and use a crosswalk at De Grassi to get to eastbound streetcars.
i.e. this could be a possible station layout, with station house in red, red arrow being a passage under (or over) GO tracks,
OL tracks in orange and platforms in yellow (not to scale!). Each 'E' could be emergency exits down to public space.