No reviewer will dare criticize this release. They're all going to gush over "SW on blu-ray finally!" because they could otherwise lose opportunities for future advance discs from 20th Century Fox or Lucasfilm.
It's going to be unanimous praise across the board. Just look at these reviews for the 2004 dvds. It's laughable, man!
http://www.dvdtalk.com/reviews/12228/star-wars-trilogy/ - "bright and vibrant"
http://www.digitalbits.com/reviews3/starwarstrilogy.html
http://dvd.ign.com/articles/545/545786p8.html
http://www.dvdverdict.com/reviews/starwarstrilogy.php - "black levels deep and rich"