Concerning AMT...
A tender for 23 multi-level coaches was published last year, but later canceled. I don't know why, however...
Works are underway to add a third track (and new signals) between Lucien-L'Allier and Montréal-Ouest. Once finished (spring 2015), this should allow the AMT to add more trains on the Vaudreuil line and the trains on the Saint-Jérôme line currently ending at Parc during rush hour will terminate at Lucien-L'Allier instead.
However, the 10 F59PH locomotives AMT bought from GO will go to Brookville Equipment Corp. (Brookville, Pennsylvania) to get rebuilt. The F59PHI are also due for a tune-up. This will affect the availability of the locomotives until the projects are finished.
The biggest projets right now for the commuter trains in Montréal (apart from the Mascouche line) are the construction of two large maintenance facilities (Lachine [~150 M$] and Pointe-Saint-Charles [~300 M$]). The train storage capacity between rush hours will be increased and maintenance quality should be increased.
Video renders of the maintenance facilities :
Lachine
Pointe-Saint-Charles :