This topic has been quiet for a while, and I haven't heard any new news. This almost feels like there is a deliberate effort underway to conceal the truth, similar to the age-old tactic of a police force promising a "full and thorough internal investigation" to get to the heart of a scandal, using that as a stall tactic until the public loses interest and forgets about the scandal.
My theory is that the plane was intentionally depressurized at high altitude until the passengers all succumbed to lack of oxygen. They were then quietly killed while unconscious, their cell phones confiscated and destroyed, and the plane then landed safely in a remote area. I have a bad feeling that it is being rigged with explosives or dirty bomb materials, and will make an appearance a couple years from now when conditions are right. It might be possible for this plane to "impersonate" another. I hope I am wrong.