I have a feeling people will still refer to the films by its respective episode number rather than it's title. The PT and OT have been promoted that way for 15 years so it has been ingrained in everyone's head. I'm curious to see the poster for The Force Awakens. I wouldn't be surprised if they included the episode number on the official posters and BD releases, especially when packaged with the other films. In the long run, it doesn't really matter to me as long as the film itself is good.