There are rumors of two possible titles:
- Return of the Sith
- Rise of the Jedi.
http://wegotthiscovered.com/movies/star-wars-episode-vii-titles-revealed/
I like "Rise of the Jedi" better. Here are a few more ideas of my own (some not so serious):
Real ideas:
- A New Enemy
- War of the Droids
- Balance of the Force
Not so serious:
- An Old Hope
- The Old Fogies Strike Back
- Wrath of the Younglings
- The Fate of Jar Jar