In Swen's latest blog post someone asked, "
Are you going to make a detailed tutorial for creating own content with the editor anytime soon? Many modders have refrained from using it and attempting to create their own content due to the complexity and sparse information about it."
Swen replied:
The next patch *should* include the exporters so you can create your own content. We needed to negotiate something with the middleware vendors first, but that's sorted out now.
I think that's as much as we know right now, but it sounds like it is on the near horizon.