I don't know, I think the whole package of special features is outstanding.
Deleted scenes from 3 episodes in HD
A blooper reel in HD
Audio commentaries for two episodes...
we never got those things for previous TNG releases.
Then the excellent making of documentaries, even another one about the remastering. Finally new interviews with Diana Muldaur! The last video interviews she did were in 1988...
Getting to see the Reading Rainbow in SD at least (better than that youtube video) is awesome, as well.
That plus all the old stuff from the DVDs included as well. This sure is a nice Christmas present...if only I could actually wait until Christmas to give the blu-rays a spin ;-)