My thinking is all along the lines of GL not showing the jump-to-hyperspace effect in the prequels to preserve those cool moments for the OT.
Don't get me wrongo, I love the prequels as they are and I really enjoyed how they incorporated the imperial march into the music it was very powerful to someone who already knows the OT (heh, I still get goosebumps when watching the movie on DVD), I just think the PT is on it's way to become one huge spoiler trilogy for people who haven't seen the OT. It's nothing bad, but first time watchers need to know that seeing them in the intended order 1,2,3,4,5,6 is not recommendable the way the prequel storyline is built.