<rant>
I think the real question here shouldn't be about framing, 4th wall, etc. The real question should be, is anyone honestly going to enjoy the film any LESS because of the change?
Yes, we are all Star Wars techies/geeks, otherwise we wouldn't be here. However, at the end of the day if changing from cropped frame to full frame is going to destroy your enjoyment of the film then don't watch the edit.
However, I strongly believe that for all of the technical discussions that have been had in this thread, at the end of the day when the edit is finally released, nobody is going to care about the arguments. Instead, they will be watching one of the best interpretations/adaptations of ESB available and will be fully immersed in the experience.
Without the technical discussions, the edit would not be what it is. That is absolutely and unequivocally true. However, it is Ady's edit and I highly doubt that anyone who has been waiting for it is going to enjoy the film any less in full-frame vs. cropped.
</rant>