Yeah he didn't ever really *look* at the Disney Face in that scene. He kept his eyes on the rest of the group until he and Annie started yelling at each other.
I definately don't think they'll be together/have started dating when the new season comes around. (I'm not sure if I even want them to, I don't want it to mess up the group dynamic).
I don't think they'll drop the notion of Jeff and Annie. Since they're part of the discussion group they will have to have eye contact and be around each other, which is where their scenes would come in to play.
OT: I love Clue. It's a riot with the mayhem and farce going on, and the suspects all investigating each other.