Flight MH370, Electrical failure, Smoke, Autopilot

Is it possible that electrical failure caused transponder and ACARS to fail, also resulting in smoke in the cockpit ? If the turn back to Malaysia was a pre-programmed flight path the pilots and occupants could have been unconsious and the plane was flying itself. So it flies on autopilot until it runs out of fuel....

Update: March 20/14 Two objects seen on satellite imagery are located about 1,500 miles, or 2,500 kilometers southwest of Australia.