Little Big Planet 2 is not going to be out until January 18th, 2011 for the Playstation 3. Sackbots one of the many additions to the sequel and you can rescue them, tell them to flee, make them scared of certain things, have them follow you, patrol, act or other things of your choice. The game is endless. Sackbots are just one feature.
Here is another video from ‘Tom_Molecule’ that goes more in depth on the Sackbots features.