With the Crosstown LRT, they plan to have three (3) connections with GO trains. At Mt. Dennis (Kitchener Line), Caledonia (Barrie Line), and Kennedy (Stouffville Line).
According to the
Relief Line North website (at this
link), there is another GO Train line that was not considered.
Here is the current GO Train map for the Richmond Hill Line, from
link:
The Richmond Hill Line passes the Crosstown LRT between the Wynford & Sloane stops. While they may not require a connection in 4 years time, they should make a provision for a further connection in a decade or two, between the LRT and the Richmond Hill GO train.
After first getting a better connection at the Richmond Hill Oriole GO Station and the Leslie Subway Line 4 Station, of course.