Bill Hunt says Disney has a 4K scan of SOTS but have no plans for it yet.
“FYI, a couple of other bits of interesting information that Chuck passed on to us from last night’s Wexler event: About 100 of the 400 or so classic Disney animated shorts have been scanned in 4K (at Warner) and restored. Also, new 4K restoration work has been done on Disney’s Song of the South to fix certain shots previously out of alignment (because of a faulty camera used during the original photography), though no public release is currently planned. Fascinating”
(I know this story has somewhat groundbreaking info on Star Wars, but I want to keep on topic).