The Blu-Ray changes have been confirmed (some but not all of the mistakes from the previuos set have been fixed and several new changes have occurred), I have a full report in the
new thread.
Also, one thing I previously missed from the 2004/2005 edition of ANH, reported on DVDActive (formerly DVDAnswers):
When Luke (in stormtrooper armor) responds to "bad transmitter" from the Imperial officer, a tapping sound effect has been added.