An open MEP is an interesting idea, but it takes away one of the biggest things about EPYC, and that’s the mystery element. Part of the fun comes from the fact that we don’t know where or what these themes are coming from. It’s more satisfying to put these videos together in the end if nobody knows what it’s like beforehand.
I know it’s probably impossible to keep all the videos from being "leaked" among friends, but I think I’ve got a plan that could keep up the mystery element in a real multi-editor project. It goes something like this:
Recruit two pools of participants: one pool of editors and one pool of theme writers. We'll leave the sign up open throughout the project... just because this is one of those "go with the flow" kind of things.
Start off the chain with a video done by either me or krzT – if we’re coordinating, we’ll need to get our contributions done at the beginning because pitching in segments later on might introduce bias.
Randomly draw somebody from the theme writers pool. Contact that person to ask if he/she has time within the next day or so to watch a short video and give it a new theme. Get two themes from the writer (it’s always a good idea to have an alternative, especially if the editor gets stuck).
Randomly draw somebody from the editors pool. Contact that person to ask if he/she has time within the next two weeks or so to make a 0:20-2:00 minute video using one of the two new themes. If the editor is busy, then try again with another random selection from the pool. Give the editor about two weeks to edit. During these two weeks, beta test the video for the editor if he/she wishes. Request technical fixes if needed. Suggest changes to glaring editing faux pas if needed. Get HQ copy of video from editor.
Randomly draw a new person from the theme writers pool… and so on.
We’ll do this for maybe ten or so cycles. To streamline progress on the project as a whole, we can get the segments ready for final encoding as they come in. In the end, we’ll put everything together and… release!
Well, it’s never that simple, but that’s the gist of it.

What do you think?
Animasia comes first, of course. But that'll be done soon. Oh yes, it will. Will will will.