Okay, maybe it's all in my head, but every time I see this particular shot, I can't help but think that the two kids look an awful lot like young Ayu and Yuuichi:
And on a related note, considering that Ayu, Nayuki, and Makoto did make a brief appearance in episode 2 of Air, what would you think the chances are of there being at least a quick Misuzu cameo (heh) in the new Kanon? Not that I'll need any additional encouragement to watch it, but...