I wish they would just release them with two aspect ratios on the Blu-ray, with a 16:9 1.78:1 theatrical format version and a 4:3 1:33:1 open-matte version.
The Black Cauldron, however, should be released in a 2:20:1 aspect ratio rather than the slightly cropped 2:35:1 aspect ratio it has on iTunes.
Also, for Disney animated movies, the ones I am really excited for a 4K Ultra HD release are the ones which premiered in 70mm (Sleeping Beauty, The Black Cauldron, Treasure Planet).
I know Treasure Planet will be a 2K upscale unless Disney can find a way to re-render CAPS animation in 4K or if they scan an IMAX print in 4K (which would look inferior to even a 2K upscale since it didn’t come from the pure digital source) but Sleeping Beauty and The Black Cauldron will look amazing when they scan the original negatives in 4K and not screw up the grain.
Treasure Planet should be in it’s IMAX open matte aspect ratio of 1:66:1, just like the DVD and Blu-ray.
Sleeping Beauty should be in it’s 2:55:1 CinemaScope negative aspect ratio while The Black Cauldron should be in 2:20:1 from it’s 70mm negative.
And each film should come with it’s theatrical audio mix (4.0 for Sleeping Beauty, 5.1 for The Black Cauldron and Treasure Planet) in DTS-HD Master Audio or Dolby TrueHD in addition to a Dolby Atmos remix for their 4K Ultra HD releases.