Hopefully you'll find a way to distract yourself over the weekend! Its hard, I know, but possible. U of T and Laurier are still sending out acceptance letters, no?
My sister has done the explore program 3 times in Montreal and absolutely loved it. I have a few friends who have also gone and they loved it as well. Do you know where explore would place you in Quebec? My best friend was placed in a smaller francophone town without any anglophone pockets and she said she learned a substantial amount of french. I think a lot of people who opt for Montreal are primarily interested in living in Montreal, which is understandable because its incredible. Its definietly possible to learn french in Montreal but its a lot easier in francophone towns within Quebec.
My sister said she also recieved a "grocery allowance" which was more than enough to live on, and all of your accommodations are taken care of. I've been wanting to do it for a while! Maybe next summer!
Its sounds like you've got a lot to think about and many incredible opportunities ahead Enjoy the weekend.