Well, what I’m trying to point out is the “anticipation” for your still incoming audit… when you wait for the audit results (just to know your auditor competency level), then it’ll be too late for you to anticipate his moves…
…you can use your first lunch together to know his strongest point e.g. if he is a mechanical engineer, chances are, he is going to screw you deeper in your process where mechanical thing is involved or whatever field he is expert… once you have an idea of his expertise, then you can somehow "hint" your next department to prepare for things he might be looking for… (I’ve learned this technique from our HR Manager in my previous company)…
…and mind you, as an auditor, it is really good impression if the organization is somehow well prepared for you… it makes you think their seriousness on their commitment and that they are an organized management…
…btw, it also reflect in the audit report… your organization strong points…