There are rumors of a Star Wars Title with two runners up: Rise of the Jedi, or Return of the Sith. Me personally I would go with "The magical journey of Jar Jar Binks" or maybe "Jar Jar's magical mystery tour" but maybe they should save those titles for his own movie since Hans and boba fett are getting their own movies.
"Rise of the Jedi" and "Return of the Sith" are both incredibly lazy titles. It's not a good sign when even the titles are cheap callbacks to the old movie titles. I'm sure Greedo's son will make a cameo, and Han(s) Solo's son will shoot him (BECAUSE HA HA FUNNY REFERENCE). KHAAAAAAAAAAAAAAAN!
If Lawrence Kasdan is truly involved then hopes are high (a new hope?). Even if he is on board as a consultant should be enought. Now granted JJ just remade Wrath of Kahn to mixed reviews, but we are not talking about JJ remaking Empire Strikes Back.
I would say the odds of success are 82% with current information.
News today that Michael Arndt is fired from writing. It is being spun as bowing out, but seriously you don't quit that gig. JJ and Kasdan are now co-writers and shooting starts early 2014 to make a X-Mas 2015 release.