As far as I know, Disney don't usually do actual "restorations", but more like "special editions" (look at what they did to their animated movies...)

I hope I'm wrong, but they may just take the negatives, recomposite everything (even add some new sfx) and sell these new special editions together with the "theatricals" ones (which would just be their versions cut as the originals).

So they get two great quality "updated" versions in one, and the average customer won't even notice the difference between their theatricals and the actual ones. It would be a great bargain to Disney.