I am hoping to see the story of Anakin's fall to the dark side, how he copes with becoming half machine, coming to terms with betrayal of his loved ones, the Emperor's increasing control over him.
I need to see how his experiences have twisted him and made him a tool of the dark side.
I want to see his conflict as he gives orders for his former comrades in arms to be hunted down and exterminated.
Of course I would love to see the continuing story of Obi-Wan, too. I think Ewan McGregor was a great choice to play him in the PT, almost as good as Alec Guiness. It would be superb if a talented actor could be found who looks sort of halfway between Ewan and Alec.
I'm sure crazy old Ben didn't just sit around in his hut for all those years, so he should have some good stories to tell.
The main problem with this series is waiting for it to happen.
The sooner the better, I say.