CoGro wrote:b) there are new scripted Vader lines that are already confirmed
What, like "I don't fear..."? That was confirmed as a Vader line, yes. But we now know that Anakin is Vader right after he kills Mace, LONG before the suit. It's very possible that the I don't fear line could come before the suit.
As for not hearing him talk in Episode III, it wouldn't bother me, honestly. It's not like I haven't heard him talk before. It might be neat not to hear him until he's torturing Captain Antilles in ANH. But I somehow think (hope?) that George isn't going to put Vader's voice in the trailer and not deliver in the movie. I know he doesn't care about fan opinions, but there could be major public outcry over that from non hardcore fans.