Where I come from (Montréal, Québec, Canada), we say Merry Christmas and happy new year 2015 like this:
"Joyeux Noël et, Bonne et Heureuse année en 2015"
Little known fact: You can identify a Québecer that lives in your neighbourhood if his Christmas tree or outside lights have no colour pattern or is not colour coordinated i.e. they have random green, red, blue, white, yellow lights.
best wishes to all!