What's the most likely scenario at this point? I gotta think its crazy/suicidal pilot followed by crazy/suicidal hijacker. Can't think of another scenario that's even close.
Transponders deliberately shut off, no communication, deliberately veered off course via guidance computer, and flew until close to when fuel would have run out. That's seems to pretty definitively rule out an accident. Of the two possible "arcs" the one over land is almost impossible to believe, so it turned SW (partially corroborated by radar) towards the wide open Indian Ocean.
But if it's suicide, why not just point nose down? Maybe he just didn't have the guts to do it and just sat there on autopilot for seven hours?
Hope it doesn't take two years to retrieve the black boxes like it did for AF.