To update you all:
We watched the movie, which we both enjoyed. Then we just sort of stood out in the lobby area and talked- for several hours, I think? About the movie, then about books, about ourselves, about our thoughts on people and different concepts, about anime (which I am afraid I may have gone too far with, though I did tell him to tell me to interrupt me if I go too far). We ended up leaving because the theater was closing up.
I'm still not sure if it was a date, though my coworker went around telling people I had a date with this guy yesterday night at work. I'm not sure if he considers it one or if my coworker was just trying to embarrass me.
Either way, it was nice, and I enjoyed it. We have a lot of similiarities, but also, of course, a lot of differences, too. Even if he is not looking for a romantic relationship, a friendship would be good, too (though I wouldn't mind the former, heh).