Sony has been pumping the user created game content stuff really hard ever since they released the first Little Big Planet. This is possibly the most interesting thing they have done with it.
Sony is allowing players to create missions of all kinds for Infamous 2 which will show up beside the normal mission’s in the world and will also ad to your XP and help you progress through the game. The beta is going to be starting up soon so that you can try out the creation tools and play some custom made Infamous 2 missions. If you really want into this beta you need to sign up here before March 21st.