Antcu, I revised my post, it was a fully digital restoration - I believe the first of its kind: http://articles.latimes.com/1993-07-31/entertainment/ca-18865_1_snow-white
I was getting mixed up with the YCM Labs photochemical restoration done for the 50th anniversary re-release. But yes, each frame of the 1993 digital restoration was output to film after completion, as the New York Times article describes: http://www.nytimes.com/1993/06/30/business/business-technology-snow-white-is-made-over-frame-by-frame-and-byte-by-byte.html
As I said before, the technology to produce a direct-digital transfer either didn't exist, was in the experimental stages, or would have been prohibitively expensive. It was major news when Pixar did a direct-digital transfer of A Bug's Life, in 1999.
And as far as The Sword in the Stone, Disney does have HD masters of quite a few of their catalog which have still never been released on physical media. To name a few; Honey, I Shrunk the Kids, Honey, I Blew Up the Kid, Homeward Bound: The Incredible Journey, A Goofy Movie. But this surprises me because it IS on Blu-ray, yet has an iTunes version that is superior! How often does THAT happen?