Wow-the color, depth and overall clarity are going to be incredible. Of the three, ROTJ gets the short end in home video with its more modern film stock looking like fuzzy video most of the time and lacking in both color and fine detail.
The ONLY SE change that was effectively done was the 1997 re-scoring of the end celebration. But I have come to understand the power of Yub Nub and its need for preservation. The original 35mm Lapti Nek sequence will be outstanding.
By now I think it's time we stop hating on ROTJ so much and accept it for what it is. This is something I realized a little while ago. As kids it was our favorite, and then at a certain age we were not allowed to enjoy it anymore. It's a simply a great dumb-at-times adventure serial. When properly watched (pre-DC LD or one of ours) it can be better experienced and this I hope will really take that to the next level.