During today's PlayStation Event in NYC, Media Molecule's Alex Evans revealed the studio has married the PlayStation Move controller with the PS Move, Sony's motion peripheral originally designed for the PS3. The Move was demonstrated as a sculpting tool with the PS4, among other things.
Really, the entire demo was an artistic suite, showing the Move being used as a paint brush and to control two dancing avatars. The sequence eventually culminated in a full rock show where players used Move to control individual instruments. While not Media Molecule's next game, per se, the demo was designed to showcase the creative power of the PS4.