One of many things which we didn't like about the prequels was that there are
almost no twists, surprises or drama. That's why I have 2 new ideas:
In the original cut when Padme gets onboard her ship and goes to Mustafar we
see Obi-Wan getting on board, closing the door with the force and staying on
the ship. I would remove everything about Obi-Wan. We see just Padme getting onboard and starting. At this point, the audience doesn't know where Obi-Wan is and what is he doing. We saw him just last time when he left Padme's apartment after telling her that Anakin turned to the dark side.
Then we have the conversation between Padme and Anakin on Mustafar - at one point, Padme says: "Because of what you've done . . . what you plan to do" Now we see that Anakin is looking somewhere and we see Obi-Wan. I would left the shot where Anakin is looking but I would cut the shot where Obi-Wan is shown.
Padme is still talking "Stop, stop now. Come back! I love you". Anakin screams: "Liar!. And the audience is confused for one second - why does he say that? And suddenly we see Padme turning and for the first time we see Obi-Wan. Of course it's only the beginning of the whole sequence because there is much more do to. It's just a rough idea I had in my head.
The next twist should be about Palpatine - I would remove every sequence or words which would indicate that he is Lord of the Sith, before his reveal to Anakin. Because in the original cut it is obvious from the beginning that he is the Sith Lord. When he is revealed I always hated that there is nothing emotional about this sequence. The music is good, but we need something more dark - like Palpatine theme from ROTJ. There is also nothing magical about the enviroment. In ROTJ (besides the dark music) everything was dark. Here we have no dark music and no dark enviroment. Something HAS TO BE DONE about it. Such a great moment and so poor done. There is of course some work on the dialog to be done. At some lines I get the impression there are talking about the weather and suddenly we get very serious lines. I would say that Lucas technique is here to blame. He makes his films from nothing. He is doing to many pickups taking to many shots from to many cuts and the actors and their emotions feel inconsistent. Example:
Palpi: "Learn to know the dark side of the Force, Anakin, and you will be able to save your wife from certain death" - He seem here very powerful and we can see that he is already seducing Anakin. Also he is smiling very like Darth Sidious.
ANAKIN: What did you say? (Lol, are you deaf Ani? - And of course it does feel very out of place)
PALPATINE: Use my knowledge, I beg you . . .(Here I wanted to laugh - 5 seconds ago he was winning and now he has to beg Anakin? Very inconsistent dialog - written and played inconsistent.
After that we dont see (I hate that) Sidious but some whiny politician. He seems to fear Anakin what is laughable, because in the OT Anakin is his bitch.
Sorry for my english. Sometimes I have troubles to express what I want to say. But I think you get what I mean.