The Rick McCallum interview on Collider is packed. He goes into a little of everything like how ILM was so busy with other projects they had to use a bunch of different studios around the globe to get the effects done. There's also this:

Do you think we’ll ever get the original trilogy and the prequels without any changes on Blu-ray, or is it never gonna happen?

McCallum: I would have to answer that officially it’s never gonna happen, but you never know with George. It’s one of the constant things that—let’s put it this way, it changes always. You never know.

Yeah I mean personally, as I’ve said many times on the site I have no problems with George changing the films, I just think it would be great if he would release the originals and that way everyone could have it, but that’s just me.

McCallum: I know, but I understand that completely. It’s just a question I can’t answer. Obviously I have my own personally feelings, I hope that he does it, but I don’t have major arguments with him about it. I think that’s a decision he has to come to on his own as time comes by.