Are there any mono tracks that have currently never been released on DVD/Blu-ray?
Some of the Dirty Harry films.
The original stereo mixes for Back to the Future haven’t made their way to DVD/BD either.
The mono mix for Star Wars has NEVER been released on video officially!
Are there any mono tracks that have currently never been released on DVD/Blu-ray?
Yes. A lot actually.
It seems like it’s more rare for the original mono to be included then not.
Sorry, I forgot to say original mono tracks. While it’s true the original tracks for the films mentioned above have never been digitally released, the 5.1 mixes still sound the same as their originals with no noticeable changes made to it.
The only film I know of where this has happened is SW:ANH. While the mono has never been officially released, the original stereo mix was first released for home media in 1982. Then in 1985 the original stereo track was remixed with changes being done to some of the sound effects and a line of dialogue being added. This was used for every home media release until the 1993 USDC/1995 Faces where it was remixed again with elements from the mono mix and new sound effects added with these changes being carried over to the GOUT DVD; and the rest is history after 1997.
Besides ANH, are there any other films where the original mono/stereo mix never got released on DVD/Blu-ray?