KCRW's Design and Architecture interviews Kim Irvine on Small World changes
It's a brief bit later on in the show. Main points:
Irvine mentored with Mary Blair.
Example of the way Disney characters would be added - a "small world doll" will be dressed as Alice and placed on the already existing chessboard with already existing rosetrees nearby.
"No decision has yet been made" regarding the possible Rainforest-to-America conversion.