At CinemaCon today, Disney revealed plans to release new Star Wars films each summer beginning in 2015. The plan isn't to go Episode VII, VIII, IX in three years but, rather, to run spinoff films in-between the major "episode releases" every two or three years.
This is consistent with earlier reports of plans for spinoff movies, plus reports that the next trilogy will pick up after 1983's Return of the Jedi. Disney's announcement meshes the two together rather definitively.
So there you have it: Star Wars will be an annual release from now on. No word on DLC plans.