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Iran...I Walked...I Jihad
Of course nothing official has been published yet, because no one knows what will happen other than JK Rowling. She's done an excellent job keeping her secrects in the past, and I see no reason why the same wouldn't hold true in the future.
I gotta disagree with your reasoning when you compare Harry and Voldemort to Neo and Smith.
Neo, as the anomaly, is supposed to represent the decision we can't see past. Though he actually is a human, he is similar to a program because he has a purpose. Neo's purpose was to end the war between the machines and man, his purpose was not to defeat Smith.
Smith, was "unplugged" because he, much like Neo, was an anomoly and he too had a purpose. Since Neo represents an imbalance in the equation, the Architect (or whoever) had to create Smith in order to balance the equation. Smith's soul purpose was to defeat Neo so this equation could be balanced once again. As explained in the begining of Revolutions by the Indian dude at the train station....EVERY PROGRAM SERVES A PURPOSE, THOSE PROGRAMS THAT HAVE SERVED THEIR PURPOSE AS TERMINATED.
That means that once Smith served his purpose by defeating Neo, he then was eliminated because that is how he was programmed. You may not know this, but Neo realized that he couldn't actually defeat Smith, but he could eliminate Smith by being defeated by Smith.
Hard to follow...sorry, but that's MY take on the Matrix.
Harry Potter is indeed THE ONE, to some extent, but neither him nor Voldemorte are programs so one won't automatically die once the other is defeated. If you were to look at it from a Matrix perspective, one would have to conclude that Harry would be filling the role of Smith instead of Neo, because it seems his purpose is to defeat the Dark Lord.