It would also make a point of Vader mentioning that Obi-Wan got away. As we know from episode IV, Vader goes to Tarkin and tells him that he senses Kenobi. Tarkin only alludes to the fact that Obi-Wan should be dead by now, presumably due to old age. Vader never says anything about thinking he was dead, only that he hasn't felt this way since the last time he saw him.
Vader: "He is here."
Tarkin: "Obi-Wan Kenobi? What makes you think so?"
Vader: "A tremor in the force. The last time I felt it, it was in the presence of my old master."
Tarkin: "Surely, he must be dead by now."
Vader: "Don't under estimate the force."
Tarkin: "The Jedi are extinct; their fire has gone out of the universe. You, my friend, are all that's left of their religion."
Vader: "Obi-Wan is here. The force is with him."
Tarkin: "If you're right, he must not be allowed to escape."
Vader: "Escape is not his plan. I must face him alone."
Would a scene like this point too clearly to the fact that Vader is Anakin? Or it would serve as a nice detail to serve as a link between the movies?
I agree with what biddy-x-wing and Darth Simon both said about the Republic gradually shifting to become the Empire. Growing up and watching the movies, I guess I never really thought about where this evil would come from, just that it took over. I think Lucas got that story point right.
As far as Bail Organa goes, I think we need to see Obi-Wan and Bail working together in the first part of the movie during the Clone Wars, and maybe just a few times shortly after the wars end. After Palpatine has ordered the Clone Troopers to turn on the Jedi, there should be a scene where Obi-Wan goes to Alderaan to find Bail. Bail is already in conference with some of the Clone Troopers and perhaps a Republic Commander and tells them to take Obi-Wan away. Obi-Wan escapes. Later in the movie while the heros are fighting fro survival, the two need to meet again. It is at this point that we learn that Bail was only posing as a bad guy, so that Palpatine doesn't hear of his involvement in the resistance.
Before Obi-Wan goes to Alderaan, there could be a scene between either Bail and Palpatine, or Bail, Mon Mothma, and Palpatine, or just Bail and Mon Mothma. The point of the scene is Bail arguing against Palpatine not relinquishing his emergency powers now that the wars have ended. Perhaps even a remark that the P.O.W.s aren't even getting trials, they are being simply being executed. Bail starts to see the Republic under Palpatine start to become more a despotic dictatorship.
What do you think?