Moving on to TV movies, many of these early titles were show in theatres outside of the US, while broadcast as multi-part episodes of the Wonderful World of Color. Later when that show became The Wonderful World of Disney, these movies where then shown it full at once.
Not surprisingly, nearly all of the pre-1980 titles will not be on Disney+ day one. When I saw
Sammy on the list I had to dig to see what else might be there, but not much luck:
Disney TV Movies (Pre-1980)
Texas John Slaughter: Gunfight at Sandoval
The Nine Lives of Elfego Baca
The Peter Tchaikovsky Story
Moochie of the Little League
Moochie of Pop Warner Football
The Horsemasters
Eflego Baca: Six Gun Law
Hans Brinker or the Silver Skates
Sancho, The Homing Steer
The Prince and the Pauper (?)
Escapade in Florence
Sammy, the Way Out Seal
The Magnificent Rebel
The Mooncussers
Johnny Shiloh
The Horse Without a Head
The Waltz King
The Ballad of Hector, The Stowaway Dog
Bristle Face
For the Love of Willadean
The Tenderfoot
Gallegher
The Legend of Young Dick Turnip
Ballerina
The Boy Who Flew with Condors
Atta Girl, Kelly!
Willie and the Yank
A Boy Called Nuthin’
Way Down Cellar
Pablo and the Dancing Chihuahua
The Young Loner
Gallegher: The Mystery of Edward Sims
Boomerang, Dog of Many Talents
The Treasure of San Bosco Reef
The Secret of Boyne Castle
Ride a Northbound Horse
Little Dog Lost
My Dog, the Thief
Secrets of the Pirate’s Inn
Smoke
Menace on the Mountain
The Boy Who Stole the Elephant
The Wacky Zoo of Morgan City
Snow Bear
Three Without Fear
Bayou Boy
Hamad and the Pirates
Hacksaw
The Strange Monster of Strawberry Cove
Lefty, the Dingaling Lynx
Justin Morgan Had a Horse
The High Flying Spy
Michael O’Hara the Fourth
Chandar, the Black Leopard of Ceylon
The Mystery in Dracula’s Castle
The Boy and the Bronc Buster
Mustang!
Run, Cougar, Run
The Whiz Kid and the Mystery at Riverton
Hog Wild
Diamonds on Wheels
Return of the Big Cat
Two Against the Arctic
Stub: The Best Coward in the West
The Sky’s the Limit
The Footloose Goose
The Boy Who Talked to Badgers
Secret of the Pond
The Whiz Kid and the Carnival Caper
The Flight of the Grey Wolf
Kit Carson and the Mountain Men
Barry of the Great St. Bernard
The Ghost of Cypress Swamp
The Track of the African Bongo
The Bluegrass Special
Trail of Danger
The Million Dollar Dixie Deliverance
Child of Glass
The Yong Runaways
Mickey’s 50 (90-minute 50th Birthday Special for Mickey Mouse)
Donovan’s Kid
Shadow of Fear
The Omega Connection
Born to Run
The Sky Trap
Some of these are on DVD and I have them, but I'm still disappointed that not even Child of Glass will be there. That one's great.
Prince and the Pauper is listed, but nothing about whether or not it's the 1990 Mickey Mouse featurette or the 60s live-action version. Probably the Mickey cartoon.