What to expect, prepare, bring to a short-noticed meeting solicited by a University Press editor? How to prepare for a meeting/discussion with a major University Press editor when they solicited/sought you out on short notice (4 days)? Because I didn't solicit them, I don't have a full manuscript -- just my conference paper, abstract, and general research ideas. What is expected in these impromptu meetings solicited by University Press editors? What should I bring to the meeting? Do they expect me to become prepared with a pitch and write a book proposal overnight? Or do I simply bring an abstract and a CV?

I would like to make the most of this opportunity, but I was solicited out of the blue during a conference and feel so unprepared. I don't want to blow an opportunity or ruin future prospects, but I have no idea what to expect. Are they meant to be low-key casual?
It is unlikely that any editor is going to make any commitment to you about publishing your work, other than a book idea. You should come to the meeting with the same attitude. Don't make commitments or sounds that seem like commitments. Take a draft of your work (or an abstract) and be prepared to (a) listen and (b) sound interested. 

Get and give business cards.