I guess what I'm imagining is a 10-30 minute video of someone designing the visual aspects of a small scene, and maybe another video of writers discussing a character, writing the dialog, and inputting the stuff into the editor. Not 8 hours of streaming. Tutorials are great, of course, but sometimes you can learn more about what working on a game or mod would actually be like by watching people working on an actual area.
Probably a heavily edited video would work best, since you can't really make a scene in 20 minutes. But you could start with pictures of concept art or however people get the scene into their head, then you could show maybe five minutes of someone working on manipulating the terrain, then skip ahead to where it's roughly completed, then do some texturing (this is the part I'm most interested in seeing, given how difficult it is) for a few minutes, skip ahead to when that's done and they start adding meshes and props and the like. I assume the process is something like that, but maybe it's not, and there's more jumping around with tasks.
Whoever is making the scene could explain as they go, though them doing a voiceover afterwards roughly describing their actions might be easier, since explaining what you're doing while trying to do something in real time can be tough. Or there could be no explanation, and it would still be helpful for people who already have a basic understanding of how the tools work. You can explain how the editor works in as much detail as you want, but just seeing at least part of the real process of going from nothing to making a good looking area would be really helpful.
I have to agree with Stabbey though that if there's going to be big changes to the editor, a video like this should probably wait until the changes are in effect, otherwise the video wouldn't be very useful (though it'd still be interesting to see how the systems used to work.) Though I don't imagine the terrain stuff will necessarily change enormously.
