"Given the 2k mastering that went on for AOTC and ROTS, and the DVD-sourced deleted scenes that will likely never be released in higher quality, there isn't really any room to climb. If eventually we get our hands on a 4k version of the films, I couldn't use it because it's be a bridge too far from the SD deleted scenes."

Another chance arises to get those HD deleted scenes... Nov 10th Blu Ray Steelbook set of the saga to be released with 40 hours of extras.

http://www.starwars.com/news/the-star-wars-saga-to-be-enshrined-in-limited-edition-blu-ray-steelbooks