I don't recall if it was mentionned here but West Jet Encore, the regional brand, have listed some possible destinations (nothing confirmed) on wikipedia(for what it is worth) Some have already been confirmed and some are only indicated as being considered. Fredericton and Gander are the only 2 atlantic destinations mentionned and are in the being considered destination lists.
http://en.wikipedia.org/wiki/WestJet_Encore