Seeking suggestions for “unofficial interview”

All—

I’m acquaintances (fellow soccer dads) with the COO of a small but rapidly-growing biotech company. While talking on the sidelines last weekend, he suggested that I meet with him and the heads of HR and R&D—he wants to get a feel for how I might fit into their organization for any current or future job openings. The meeting is scheduled for next week, I’m wondering if anyone here can provide suggestions on what to anticipate and how to prepare for such an informal “interview”.

Re-listening to the DISC profile casts and revisiting the Interview Series are obvious first steps, as is updating (and bringing) my resume.

I assume this is mostly a “get-to-know-me” meeting, and that I should be prepared to talk about what I can bring to the company as a whole? Has anyone else been in a similarly-vague interview? I’m currently employed and well-compensated, but have limited room for growth (big fish in a small company pond). My motivation is to learn about new opportunities and challenges in this growing company. 

Thanks in advance for your feedback!