I look out, over the thin ice before me....
Having said already that I don't think we're a movement about orthodoxy, what's a common UU theology going to look like?
My guess is that there will be a core of work that deals with the implications of those values that we assert we have in common--the UU 7 Principles--and those that I've already pontificated about previously. Once that work's done, and we've described the implications, theologically-speaking, our various communities, the UU Christians, BUUdhists, etc., can wrestle with the specific concerns presented by the intersection of that theological work and their faith tradition.
Anyone else up for starting to gnaw on this bone? If so, I could post seven distinct posts--one for each principle--where we can discuss and contemplate them, and an extra one to handle anything extra that comes up.