Eh, there's still a ways to go. According to this website: (
http://www.ultimatedisney.com/ultimateclassics.htm), we still haven't gotten the following in platinum:
- Pinocchio
- Fantasia (Both original and "2000" versions)
- Dumbo ("Big Top Edition," but no "Platinum" yet)
- Various "Package Features" (Saludos Amigos, Make Mine Music, etc.)
- Alice in Wonderland
- Sleeping Beauty
- The Sword in the Stone
- The Aristocats
- Robin Hood ("Most Wanted" edition, but no "Platinum")
- The Many Adventures of Winnie the Pooh ("Friendship Edition," but no "Platinum")
- The Rescuers
- The Fox and the Hound
- The Black Cauldron
- The Great Mouse Detective
- Oliver and Company
- The Rescuers Down Under
- All other Animated Features released since The Lion King
Lots of good ones that haven't made the jump to "Platinum." And, we musn't forget
Song of the South.

I doubt all of these will receive the Platinum treatment, as there were some real duds out there, like
The Black Cauldron.