I actually think Disney is going to go back, 4k scan the original film since the SE would be an upscale to get it to 4k ( I think). They will clean that up and release it. From there, I could see George and Disney working together to create a new Special Edition with updated SFX/CGI to make all their ‘new canon’ fit better.

This is all just made up in my head but Disney is flooded with cash and re-releasing ANH using the SFX they used for Rogue One seems like something they would do for the 40th.