Also you need to be registered as a voter by Elections Canada and remember, after you become a Canadian citizen please allow at least two (2) days till you apply for Canadian services like a passport. The reason for this is because CIC is gotta update the system with you new status... that being said, i dont think (i might be wrong though) one day you get your citizenship certificate in the morning and by the afternoon your info will be updated in the voters list.
BUT, remember, if you dont get your voters card in the mail, you can always call Elections Canada and get your info updated EVEN on the same day the elections are held... so.
I guess its a wait and see what happens...