I saw JJ's Star Trek only once. I don't really consider myself a Star Trek fan, but I was curious. For me it was unmemorable. But that said, I really don't know what to expect from him in regards to a Star Wars film.
If they are characters I actually care about, unlike Star Trek, then I will just have to see how they are written and how they are directed and what everything else looks like.
One thing is for sure, Kathleen Kennedy will keep him in line. I'm pretty sure of that. I don't think she'll let him take it too far from where the films were previously in terms of look, feel, etc.
But if it were me, if I were to be offered a dream job like this after being a fan for as long as I have been, I'd know what the fans want to see. I'd also know that if I wanted to do things right, really right, I'd want to hire as many of the original crew members as I could and do as much with the old school effects as possible. That means ILM and the archives would be at the top of my list of things to check out.
JJ has an opportunity to lear a whole lot more about filmmaking than he's ever experienced before if he digs right in at ILM. That's gotta be exciting!