LocoRoco is coming to the PS3, but it might not be in the form you expect. At Sony's Japanese PlayStation Premiere event, the company announced the tentatively titled Buu Buu Cocoreccho! by LocoRoco, a sequel that is "LocoRoco, but it's not ... a peculiar extra chapter."
The announcement, as translated by IGN, goes on to cryptically state that "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." So is it a game? A glorified screen saver? A virtual LocoRoco ant farm? Who can say?
Whatever form it takes, the "game" will use Sixaxis motion controls and should be available as a PlayStation Network download soon.