The internet has been abuzz with the confirmation that George Lucas has seen fit to tinker even further with the beloved original trilogy. In my opinion the change that is the worst is the decision to have Darth Vader yell "Noooooooooo" when he picks up the Emperor to save his son Luke at the end of Return of the Jedi. What was once the most powerful and important scene in the whole series has now been ruined and will give most any fan horrible flashbacks to the same "NOOOOOOOOO" that was used in Revenge of the Sith.
In regards to the other changes the Obi-wan Krayt Dragon scream is a disappointing change but not the worst. The Ewoks blinking is barely noticeable and not worth getting bent out of shape. My favorite addition is the CGI Yoda in The Phantom Menace due to the fact that I never felt the puppet looked as good or realistic in the original trilogy. Please understand that I by no means mean to disregard against Frank Oz and his fine work.
I feel to speak any further until I receive the actual discs and have time to review all 6 films fully would be disrespectful to my readers and the crew that has worked on the Blu-ray release.