I counted 22 proposed new stops on the Metro. That would bring Montreal's total up to 90 stations. Pretty impressive for a North American city of 4 million people. The new metro cars should be ready long before these ever open though.
Blue Line East:
Good move. This area has a lot of people living in it, and is poorly served by public transit.
Orange line loop:
The stations in Montreal make sense, but I'm not sure Laval needs more stations. It isn't exactly densely populated.
Yellow line extension to McGill:
Interesting proposal. McGill station is definitely where a good chunk of commuters go. I'm not sure it's a priority though. I tend to think Griffintown is more deserving.
Yellow line extension into Longueuil:
I live on Montreal's south shore, but the areas they are choosing to expand to in Longueuil seem a little odd to me.
6 new stations all in the Vieux-Longueuil borough (the first three make sense for the most part, although I think that this area could get by with only 2, one in the middle of the old downtown area, and one at Eduoard Monpetit CEGEP).
The other 3 of them are located along the very suburban Roland-Therrien Boulevard instead of the slightly less suburban (and more central) Chambly Road.
Meanwhile Brossard, Saint-Lambert, Greenfield Park and Saint-Hubert aren't served at all by this plan. These areas (except for parts of Brossard and Saint-Hubert) are more densely populated than the Roland-Therrien corridor in Vieux-Longueuil or the proposed spots in Laval.
What was left out (IMO):
The blue line isn't being expanded west to Concodia's Loyola campus (which seems like a no brainer to me).

source:
http://www.facebook.com/group.php?gid=143472233945
The green line should expand west further into LaSalle and eventually Lachine as well.