Just an update here ...
Spaced Ranger said:
From what I've read, only Criterion's 1989 "special edition" laserdisc was color corrected to director Stanley Kubrick's personal specifications, http://www.lddb.com/laserdisc/00997/CC1160L/2001:-A-Space-Odyssey:-Special-Edition-%281968%29
which, by that release, should be the only other permanently non-fading record of the movie.
That laserdisc mention was from captainsolo's referenced article The Big Picture: 2001 on Video by Thomas E. Brown http://www.visual-memory.co.uk/amk/doc/brown2.html, about the Criterion CAV 3-disc Laserdisc set (1989) mastered from a 35mm scope print (due to lack of 65/70mm transfer equipment at that time) with meticulous inspection and approval by Stanley Kubrick.
Also there, author Brown mused on something intriguing but not further explained (don't you just hate when they do that?):
"Even today the Criterion transfer is worthwhile viewing and no version -- except the as-yet-unreleased (although broadcast) digital transfer from a new print supervised by Kubrick, using new technologies -- captures the deep black of Kubrick's space scenes as well."
[emphasis mine]
I never did figure out anything more until just recently, when inadvertently stumbling across an Amazon website description of a DVD release of 2001 ... only on the UK version (as opposed to the US version) of that page! https://www.amazon.co.uk/2001-A-Space-Odyssey-DVD/dp/B000056WOM
2001: A Space Odyssey [1968] [DVD]
Reviews
From Amazon.co.uk
...
On the DVD: ... Shortly before he died Kubrick supervised the restoration of the film and the production of new 70 mm prints for theatrical release in 2001. Fortunately the DVD has been taken from this material and transferred at the 70 mm ratio of 2.21-1. There is some slight cropping noticeable, but both anamorphically enhanced image and Dolby Digital 5.1 soundtrack (the film was originally released with a six-channel magnetic sound) are excellent, making this transfer infinitely preferable to previous video incarnations. --Gary S Dalkin
[emphasis mine]
(Note: In typical fashion, Amazon has this same description on the different, multiple releases of 2001.)
This "Kubrick supervised" restoration is alluded to on the Warner (2001) DVD case ...
... where it states "SPECIAL FEATURES: NEW 2000 DIGITAL MASTER FROM RESTORED ELEMENTS".
That would make the Criterion 1989 laserdisc and the Warner 2001 DVD two releases of the Kubrick hands-on restoration (particularly regarding color correction) commercially available to us.