Hi Avery,
Accessibility and translation are very much in my mind as I'm working on the current script. An issue to keep in mind is that the various language editions of Wikipedia have variations in policies and workflows, so translation alone may be insufficient to adapt a video or tutorial from one language edition of Wikipedia to another language edition of Wikipedia.
I like the interactive nature of the Wiki Ed tutorial. WMF's Growth Team is developing in-context help, which I think is also a good method for teaching. My guess is that the optimal ways to teach how to edit Wikipedia will be a combination of methods including video, interactive tutorials possibly with quizzes and certifications, in-context help, and individualized help. As an example of how the methods could be blended, I think that in-context help could offer video tutorials of varying lengths to cover certain subjects.
Thanks for the comments.