The Ewok eye blink is actually a change that is GOOD. Vader saying "Nooooo" is...well, unnecessary. Wouldn't that deep baritone have alerted the Emperor that something bad was about to happen to him? I will say, however...it sounds a helluva lot better than how he said it in Revenge of the Sith. CGI Yoda in Phantom Menace? Hell yes. The puppet in that movie looked like crap. Obi-Wan's new Krayt dragon imitation? What was wrong with the first one? And the newest Han vs Greedo...honestly, in this one, you blink, you miss Greedo's shot...still not right, but a damn sight better than the first time he changed it.
One thing I will say...I was rewatching A New Hope the other night on DVD(the special edition version) and when it came to the TIE fighters vs. the Millennium Falcon scene, there were very, VERY obvious matte shots that weren't cleaned up. I hope that'll be fixed for the Blu-ray...