Here is the transit proposal by Aéroports de Montréal, presented at the National Assembly, regarding the future two LRT lines (West Island and South Shore). Their proposal would link both projects so there would be only one 50km line linking Pointe-Claire (and YUL) with Brossard, passing through Downtown in the process.
Here's a render for a future intermodal station at Dorval AMT/VIA station near the airport:
http://montrealgazette.com/news/loca...nd-south-shore