In the latest press conference they confirmed that the primary radar data from the aircraft suggests a turnback right before it was lost.
And the unidentified aircraft they picked up 200 miles NW of Pulau Pinang might be MH370 or it might not, they're still trying to confirm that. But apparently that aircraft was heading north, was not deemed a threat and thus not intercepted.
So if the unidentified aircraft was MH370, which is just possible not sure at this point, it would have crossed Malaysia and was heading into the Gulf of Bengal towards Burma, Thailand, maybe even Bangladesh or India. Why would an aircraft with a technical failure take a longer route towards possible landing sites just to fly over these and end up in the Indian Ocean is beyond me. Then again the guys with the stolen passports are illegal immigrants not terrorists. Autopilot messing up seriously? You should notice when you do a >90° turn. Huh.