Based on this discussion with blackstar9000, and based on the fact that the information people find useful is likely to vary from person to person, I feel it would be useful to start a discussion as to what information a "statistics" pane (or bubble, or whatever) might share for a given subreddit. I'm posting my ideas below not to give them any primacy, but to start a discussion about what people think would be useful, what people think would be harmful, and what people think would be superfluous.

Partially because I'm in a hurry and partially because I don't want to color the discussion, I'm going to leave this hanging for a bit and let others comment first before I share my ideas.