Thanks. Are you talking about the one based on Mimesis? (http://mimesisrpg.com) Do you know if it is released yet? Do you think it relates to Unitarian principles then? I couldn't tell much about it though it looks interesting.

I also found "Living in UUville"
http://www.pitt.edu/~jdl1/UUcurric.htm#Living_in_UUville

which could be interesting, but more curriculum oriented, though it has the advantage that it can be played in a short amount of time per session.