Quote of the day. In regard to the disabling of the transponder and apparent change of course, the situation is "Consistent with deliberate action by someone on the plane."
Malaysian prime minister states they are increasing their investigation into the crew and passengers. Also stated the last ping originated from one of two corridors, neither of which was where the plane was supposed to be.
I'd imagine there is far more information available to those in power that is not being released and the Malaysian government, the airline, and others have a much firmer grasp of what's actually going on than is being made public.