I found a better source for the 2020 figure… Disney’s official SEC filings for Q4 FY2013:
https://www.sec.gov/Archives/edgar/data/1001039/000100103913000164/fy2013_q4x10k.htm
“Prior to the Company’s acquisition, Lucasfilm produced six Star Wars films (Episodes 1 through 6). Lucasfilm retained the rights to consumer products related to all of the films and the rights related to television and electronic distribution formats for all of the films, with the exception of the rights for Episode 4, which are owned by a third-party studio. All of the films are distributed by a third-party studio in the theatrical and home video markets. The theatrical and home video distribution rights for these films revert back to Lucasfilm in May 2020 with the exception of Episode 4, for which these distribution rights are retained in perpetuity by the third-party studio.”
Well, THAT’S definitive. I’m sure Disney will work out something to include IV with any movie set, but I’m sure the accountants will want to wait until May 2020 to ONLY worry about IV.
Disney will never release Star Wars individually, even if the rest of the Saga and/or Original Trilogy will be released by Disney.
Fox will probably release Star Wars and maybe it will have matching artwork but Disney won’t do it.
Disney can, however, include Star Wars with the rest of the Saga and/or Original Trilogy in a box set as long as they have permission from Fox.
Disney already did it with The Incredible Hulk (Universal) in the Marvel Cinematic Universe: Phase One box set and with Lupin III: The Castle of Cagliostro (Eastern Star Media/Discotek) in The Collected Works of Hayao Miyazaki box set and they had permission from the companies that distributed the respective films from their respective box sets as well as the fact that Disney owns every other movie in said box sets.
In The Incredible Hulk, Disney didn’t author a new disc, they just recycled the same content from Universal’s disc.
Though with Lupin III: The Castle of Cagliostro, they did author a new disc just so it will have the same menu style as the other Studio Ghibli Blu-rays by Disney and so it won’t have bonus features like the other movies in the Hayao Miyazaki box set.
They also used a DTS-HD Master Audio 5.1 version of the remastered audio mix from the 2014 Japanese remastered theatrical reissue which was only in a lossy form in the US standalone and Japanese Blu-rays.
And they also upmixed the Streamline dub to 5.1 for their box set but they only duplicated the mono channel in all of the speakers.
So maybe the Star Wars Blu-ray by Fox can be also authored similarly to the other movies.