It'll be about Anakin Solo, I'm sure. (Or at least he will probably be in the film.) And well, are you sure this isn't a prank or something? I heard earlier that Lucas is absolutely not going to make any more SW movies. Well, maybe he changed his mind.
I think he should make a movie about what happens between episodes III and IV, like how the rebellion begins and maybe some earlier adventures of Han, Lando and Chewbacca. That is, unless he's going to butcher them.