I've actually thought of re-writing the prequels myself. Though, the thing that irks me is that the whole "your father wanted you to have this when you were old enough", "No, I am your father(shock)!", "Leia's your twin sister". Thing could have been so, easily perserved. Example of one scene following:

Anakin wakes up after having a horrible dream.
(insert the actions in episode III up to it was only a dream)
Anakin: *goes and, picks up his lightsaber*
I want him to have this. To become a jedi master.
Padme: Him? How do you know it's a boy?
Anakin: He was in my dream.
Padme: Now, how could that be a bad dream?
Anakin: There was something else... You die in childbirth.
Padme: It was only a dream.
(conversation carry on as in the movie)

The above would also take care of why he only knew of Luke and, not Leia. More would have to be done to perserve the suprise of the Father thing though...