I really don't think there's anything wrong with the new SE emperor conversation. I think the line 'I doubt he is the offspring of Anakin Skywalker' really emphasizes the gap between the PT and the OT. About the 'young rebel that destroyed the death star' line, I think it should be changed to 'young padawan.' What they did know about Luke at the time is that he was a young padawan... I'm not sure how they managed to know what his name is yet. There is no reference to this... e.g. when Vader tells Luke that he is his father, how should he know Luke's name? Did he sense it with the force? It's confusing. I also think that the line 'the son of Skywalker must not become a Jedi' should be changed to 'the young padawan must not become a jedi,' since they still are not sure if Luke is Darth Vader's son at the time.