Over the last couple of days you've probably seen some of the outstanding work that the Closed Beta teams have created using the tools, and now we're giving everyone else the chance to join the fun. Keep in mind that we are considering this release "Beta" software, so it’s still a little rough around the edges, though we’ve worked out many of the kinks. Also, though most core functionality is editable as of this release, there are several more advanced areas of the tools that are still being worked on. One example of of a tool to be delivered in a future update is the Single Player Editor.