My favorite theory so far: the timing was designed to destroy Fox News forever, by forcing them to go with Jerry Rivers as their on-air anchor for over an hour during the event, until a grown-up (Bret Baier) could get to the studio.
And since Congress was back in session today, the announcement last night would make everyone focus only on Bin Laden and Obama...and not Congress. Oh wait...
Yes. That was very, very painful.