the 'big head thing', aka Deus Ex Machina, is NOT the Source. He is the God of the Machines, aka Deus Ex Machina. And Neo is glowing because he is now permanently connected to the Source, as all things that glow are. Did you read the link posted above?
Neo is not dead because he was jack-in to the matrix in machine city of which everything and all un-freed humans are connected to the source, so they cannot die.
Just like when Neo was first freed. In the matrix he was suffering cardiac arrest he then died in the matrix, which caused him to wake up in his pod in the real world (because he was still connected to the machines and therefore the source) when the machines disconnected him and flushed him from his pod he was no longer connected to the source and thus he could now die in the real world (he would have drown if the Neb had not pulled him from the water). This was the same with Karl Popper.
So going back to Revolutions, as Neo was connected to the machines again in Machine City and therefore the Source, no matter what happened to him in the matrix his body, in the real world, could not die.
__________________ "Why do my eyes hurt?"
"You've never used them before."
"Always remember...your focus determines your reality."
May whatever God you believe in...have mercy on your RSIs. May the source be with you.
So, what I don't understand is the Matrix you all get caught up in trying to talk about this MOVIE... It's just like any great story told before and different people will come to different conclusions, not everyone shares the same intellect, emotional maturity, or life experience...
Now, for those that saw the movie for what it was and watched through until the end without trying to develope metaphors or analogies for it, Neo WAS "THE ONE" so when he went to the machine city he was introduced into the system itself (kinda like TRON), so now Neo is ONE with everything within the Matrix.
To speculate if he could move away from the Matrix and create new worlds would be out of our jurisdiction as movie viewers, it's up to the creator(s) to either give us that information or let the story be. To me the trilogy has walked a fine line of almost overkill but they managed to successfully create 3 movies about the same thing but different, but barely.
If they do come back to it I hope that it would be like Lucas did with Star Wars and incorporate new technology and have a much more advanced storyline as we as a people should be in a more advanced technological era.