From TFN forums:

Posted by Kenkraly

Here's a response I got back from LFL via e-mail today about the blu-ray release here it is : Thanks for reaching out. We are glad you are excited about the Blu-ray release. We put a lot of hard work into it to really give the fans something special. Regarding your questions; 1. Industrial Light and Magic did go in and make many technical improvements, most notably color matching on select lightsabers shots. 2. The list of extras for discs 7 & 8 are currently available online! We released all of that information on May 4th. 3. The Blu-rays will be the special editions of the movies.