Well, that was easy. The interview was all of 7 minutes and all the interviewer did was review the answers my wife gave to a questionnaire that you have to feel out before the interview (name, birthplace, list of marriages, kids, ever arrested, etc).
Wow, what a relief. I feel very relaxed. I'm tired too, cause we got up quite early to go but I can't complain. So now my wife has a conditional permanent resident status, good for two years (basically a 2 year green card). Then in 2 years we apply for a permanent green card. And a year after that she can apply for citizenship if she so desires.