The City of Gatineau is exploring its future options for integrating transit into Ottawa. Below, I've attached the presentation that it made publicly today.
At a high level, it is exploring how to get either a tram or buses across the Portage bridge, then running a tram either along the surface of Wellington to connect to Rideau, underground under Sparks Street to connect to Elgin with underground connections to the O-Train, or continuing buses that would extend into the downtown core.
You can see full details of those scenarios by clicking the presentation below in either French or English.