I expect some changes for Season 2. The budget is going to be slashed. Going from CBS to CW, means less money to produce the show. That's why they shifted production to Vancouver. I would expect cast changes, as not everyone will want to go to Vancouver. I think Calista Flockhart will either replaced or recast. I don't see her going to Canada to do a show, she only appears on for a few scenes. Also, CW is a step down from CBS.
With CW, being the home for the DC Universe; there maybe hope for a Season 2 of Constantine eventually.
http://masterherald.com/constantine-season-2-may-get-revived-if-dc-pursues-the-expansion-of-its-extended-universe-on-tv/39754/