A lot of people worry that JJ will take Star Wars to a different direction, I did at first, but after thinking about it, I think JJ will stay true to the Star Wars world. He will try to make Star Wars similar to how George Lucas did it, but of course, JJ will put his own style into the film too. No, I don’t think JJ will load up the opening Star Wars crawl with lens flares, and I’m sure the John Williams opening theme will still be there.
Thing is, you just never know how JJ is going to make the next Star Wars film. He’s going to bring us a lot of secrecy just like he did with his previous films. We will never know if Han, Leia, or Luke will be a part of this story ’cause he’s going to be secretive about it. The same whether or not Darth Vader or Yoda will make a return. For “Super 8”, he wouldn’t show us the monster in the film until the film came out, and he wouldn’t reveal the “Star Trek: Into Darkness” villain until later. Who knows what he’ll pull on us for the next “Star Wars” film. Yes, the script for Star Wars 7 is already finished, so we’ll never know what the plot will be.
Now that a director is finally found, you should expect casting to start real soon. There is no chance of Natalie Portman or Hayden Christensen returning, of course, but Samuel L. Jackson has a chance in returning, though. If the story does continue the lives of Han, Leia and Luke, that would be pretty amazing. Lando needs to comeback too, and yes, Chewbacca as well. C3p0 and R2 will probably return. The whole Star Wars gang just might come back.
Honestly, I don’t want Vader to return, I hope they made a new villain. I think JJ will make the light saber battles and the tie fighter scenes pretty enjoyable. JJ might do a good job, so I will give him a chance, ’cause I liked what he did with Star Trek. That’s probably what Disney wanted him for ’cause they liked what he did with Trek.
JJ is not dumb. He will give what all Star Wars fan would want, a great Star Wars movie. He’ll do the Star Wars franchise justice like he did with Trek. I think he will do fine.
Kev
K'Brocking 
My only concern about Abrams directing doesn’t have anything to do with his style. Before, he’s been on record as being “reluctant” to accept directing any new Star Wars films, and even after he’s accepted the role of director, he doesn’t seem THAT enthused. I’d rather have someone who is very enthusiastic about it. I know Lucas had Kershner and Marquand hired before, but Lucas was with them, too, and even the prequels had his enthusiasm.
All the stuff Abrams has done before, you can clearly tell he loved it. And I’m sure he’ll be professional and is a good choice in terms of skill (spectacle, effects, a simple story told simply, which is not a slam against him or Star Wars, but we’re not doing Tolstoy here, and it doesn’t need to be.)
Don’t get me wrong, I’m not slamming the guy, and I’m sure he’ll step up, but I would have gone with someone who was chomping at the bit to do it, and there’s no shortage of talented directors who would have killed for it.