To add to what crissrudd is saying, I feel like waiting another three years has other advantages for Lucasfilm aside from just the rights issue.

Some people are only just now getting around to buying the 2011 set. I honestly feel like we weren’t going to see a major reissue with actual new content until the time came to put the movies out on the next format. We’re only a year into 4k discs being a thing, and Star Wars has taken a long while to hit each new format.

To me, this is yet another sign pointing to 2020.