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This is exactly what I think. Based on Sean's interviews where he said that you could meet other players in the game, and in fact it's theonly way to know what you look like, but that it's extremely unlikely to happen, my guess is that this was something they figured they'd have time to add in an update. They've already said loads of updates are on the way (check patch 1.03) so seems perfectly reasonable to me.
Could it also be possible at the time of that quote they still intended there to be multiplayer. Maybe it got pulled after the interview?