For me it's gotta be about Luke. I'm sure it's tempting to bring in a new lot and pass on the torch and all that but, for me, Star Wars was all about Luke. I know with the prequels it was supposed to turn the story arc into a Vader centric one about his redemption but in my mind the originals were about a naive idealist lower class kid who got swept up into into what he dreamed about, found it tough, made mistakes, nearly lost his humanity but eventually triumphed. The redemption of Vader was just a result of Luke's triumphant refusal to be seduced. Luke's adventure is why we all fell in love with Star Wars.

Of course, with it being set decades after ROTJ, new and younger characters need to be introduced but I'd hate to see Luke be killed off in the first episode or just play some cameo role.

Also, please cast unknown actors. I don't want to see Iron Man in Star Wars!!

I'm a bit funny about Luke, I agree the first trilogy was all about his journey, but his type of character by its nature tends to be quite boring, as he tends to be the every man who you relate to and that it is through his eyes that you view this amazing world, and as a result of that it is more of a case that he is surrounded by more interesting characters than he is. You kinda get the same sort of thing happening with Neo in the Matrix, his character is pretty boring at its core, but the fact serves the story well. With Luke if you think about it when you first saw Star Wars as a kid, sure in the playground there'd be the odd one who wanted to be Luke, but it was more likely that you'd find people wanted to be Han Solo because it looked like he had more fun, was more of a rogue etc.