The Bluray is the main source for most of the video. Shots that were altered for the SE are being replaced, either partially or completely, with material from other sources. The aim is to use 35mm film scans whenever possible, since the increase in resolution over the GOUT is enormous; but not every shot is currently available in 35mm, so other sources have to be used instead in some cases.
Shots that were altered with CGI are the highest priority for despecialization, but restoring original composites and mattes is also an important goal, in order to get the movies looking as close to their original appearance as possible.
As more 35mm material becomes available, future releases will include more and more of it, assuming Harmy has time to make new versions.