Ah, here's some more info:
http://kotaku.com/gaming/ps3/gdc-07-sony-reveals-littlebigplanet-242171.php
Apparently, in this game the environments are user created, and what we're seeing is four players playing at once.
Sony's gonna have some kind of online thing for the PS3 called "Home" apparently, so you could download levels for something like this and play with people online.
http://kotaku.com/gaming/ps3/gdc-07-sony-reveals-littlebigplanet-242171.php
Apparently, in this game the environments are user created, and what we're seeing is four players playing at once.
Sony's gonna have some kind of online thing for the PS3 called "Home" apparently, so you could download levels for something like this and play with people online.