Hi. I have noticed that since launch, there is quite a number of people asking for tutorials in using the editor. Sometime around launch I found the official documentation for the new free SDK:
I can't find the link here, so I had to make a google search to find it again. Maybe this link should be stickied somewhere? I find it to be really really extensive.
Coming from UDK the documentation (the UDK doc's suck), this is all that I had hoped for; vast and easy to understand with screencaps and examples.