I think this is the Locoroco "screensaver"
http://ps3.ign.com/articles/805/805612p1.html
Should be out soon, it's 95% complete.
http://ps3.ign.com/articles/805/805612p1.html
Sony describes the game as "It's LocoRoco, but it's not -- a peculiar extra chapter." That, and a sentence with three different uses of the world play: "Even if you don't play it [as in control the game], the world and the LocoRoco will play [as in both playing amongst themselves and as in playing back like a video] on their own."
Whatever all that means, the PS3 version of LocoRoco is said to feature 200 LocoRoco characters in a new world. You'll be able to use the SixAxis for motion-based controls.
Should be out soon, it's 95% complete.