What's Kane's story? (C&C)

So Kane pretty much drives the tiberian universe and is an enigmatic leader who keeps comming back no matter what. When Tiberian Twillight was announced they said they would resolve Kane's story and finally explain who and what he really was. By the end of the game you still have no answers and actually have a few more questions.

As far as I can tell, Kane seems to be an alien but different from the Scrin. He has lived for hundreds of years and is alluded to having started the whole Kane and Able story in the Bible, so potentially there was another alien with Kane when he ended up on earth.

What we know (tiberian universe related, Red Alert is probably not canon for tiberian Kane):

• Kane was helping humanity develop (and tries to develop them into cyborgs on occasion).
• Kane knew about Tiberium before it landed, and knew how to chemically work with it before anyone else giving him a massive share in the world economy
• The Tacitus warns of the Scrin, meaning this is another alien race. Kane is likely an alien of this race, possibly exiled or stranded.
• Kane is unnatrually resiliant, much more than the Scrin. The Canon version of the first game is that Kane gets almost directly hit by the Ion canon and somehow survives. He also gets stabbed through and shot.
• Kane from after Tiberian Firestorm might actually be Cabal who is seen changing its voice and appearance on screen to Kane's while a Kane in a vat (clone or the surviving real one) is in the foreground. Alternative is that Kane uploaded himself prior to getting hit by the Ion canon and used Cabal's form. Or as is assumed by the wiki Cabal is just an AI and managed to save Kane.

More info: http://cnc.wikia.com/wiki/Kane

So what is he? Where does he come from? Whats his real story?