Since this was posted on 5 December and has a fair amount of attention now, I'm surprised that Expedia hasn't officially responded yet. Maybe because so much of the attention has come in the past couple of days. I sent them a Tweet asking what was going on, and I notice someone posted this on their Facebook Page.
Well, it's there[1] and a bunch of people seem to have seen it. Expedia has replied to posts made by others after this one but they seem to be ignoring this.