Quite a few, Vader in IV wasn't a sith, he was just a Imperial officer/emperors right handman, look how badly he was treated in the film by leia and Tarkin. His name was actually Darth . The Emperor was just a figurehead and the regional governors like Tarkin were the ones runnning everything. The fact that no one believed the jedi/force existed after like 19 years, people like motti (Officer who gets strangled in ANH) would have been like 20ish during the CW so would know SOMETHING. Imagine Football/Soccor being banned suddenly right now. Surely in 20 years you'd remember it wouldn't you, especially if the person who banned it's right handman was a goalkeeper and carried a nike branded football. Don't forget the obvious plotholes (Leia remembering her mother, "from a certain point of view," The fact that a bit of common sense could have foiled palpatines plans. Dying of a broken heart )
But hey, blu-ray news you say? Depending on the film cgi changes i'll pick up the OT. I'll only pick up the PT if either a)I'm forced to, because thats how it's packaged. b) It's a gift or c) It has great bonus stuff.