Gamersyde has posted an interview with Alex Evans from Media Molecule. Though there is not much new you do get a quick look at the costumes and see Sackbots being controlled via the Controlinator (DCS). You can see that the Sackbot controlled by the player automatically adopts the costume of the player.
By the way, you can change the jumping behavior of Sackbots by simply attaching a gravity switch to them. So if you didn’t like the jumping in Little Big Planet 1 you can change it in Little Big Planet 2 as you wish. The whole process takes less than a minute.