So, possibilities:

A. Brand new scan of the ON, with all original optical effects recomposited. (the original plan for the SE; unlikely due to having to find every element again)
B. Scan of '97 SE, with '11 effects redone in 4k. (making a 4k version of the Blu-ray, perhaps for theatrical/3D viewing; likely due to the SE being "George's vision")
C. Scan of '97 SE, replacing the CG additions with original optical effects. (making a mostly-despecialized edition/original plan for the SE; possible because it's "good enough" for most purists)
D. Scan of '97 SE, to have a 4k version of the '97 SE. (neat for preservation of a lot of people's first theatrical experience of Star Wars; doubtful because '97 Jabba should not be seen by human eyes ever again)

What else do we have?