Ed Stetzer shares plans for draft a manifesto, I kid you not.
Hmm. Personally I think 'missional' is an extremely ugly, silly word. The idea behind it is good, but not especially amazingly revolutionary. Not sure if it's worth the effort to nail down in a manifesto.
And 'missional' is one of those concepts that you're not allowed to criticise without people accusing you that you haven't understood it, which is a bit annoying.