The pilot was the hijacker. Who took 238 passengers and crews with him as hostages, to have the disgraced opponent party leader (who also is a relative)to be released as exchange. He set the system as automatic to avoid the flight to be detected by the radars, kept the plane flying during the prolonged negotiation. But the Malaysian government refused him firmly. He killed the hostages first by let the plane flew to the 47,000 Ft extremely high altitude, than had the plane landed on the sea when the fuel emptied.
That 's why the Malaysian government said they do have more information to be revealed later on.
That 's why whose wife and kids have moved out from their villa and, the lady was very calm after the flight had lost the contact.