Wow! I finally remembered my login details after several years away!
Been stopping by now and again to read some of the progress of Ady's edit. But I just read the latest topic ideas of inserting "Luke" into Palpatines speech.
Not sure if it was discussed, but wondering why Lukes name is to be inserted? As to me this doesn't make sense.
Palpatine to my knowledge does not know Lukes name at this point. But "young Skywalker" is a reference to him "feeling" with the force that the offspring of Anakin is on the scene, aka young skywalker. Infact, as far as we've seen in the movies, even Vader should not know Lukes name seeing as he wasn't present at the birth or upbringing of Luke. Only way I can see Vader finding out Lukes name in Empire, is perhapse word of mouth of the hero of the battle of Yavin. .. Which in turn i suppose Palpatine could have heard it too.
But, this scene indicates that this "new Enemy" is new news to Palpy. And it is after this scene that Vader mentions Lukes name, though his info likely comes from any one of the captured gang on Bespin. (who knows what was said at that table with Vader/han Leia etc..)
Anyways, just puttin that out there. peace out! ;-)