ok ok here we go correct me if i am wrong this is just what i got from the movie.
Thomas Anderson = dead (look at park bench... memorial for the MAN who saved the matrix)
Neo = alive. Neo is a program. The One is a program just as the Architect, the Oracle, Smith, and Sati.
Psychical appearance in the matrix means nothing. The Oracle is looks old because what do you think when you hear the word oracle. I think old and wise... hmmm.... Now Thomas Anderson was the new shell for the 6th "one" just as the oracle has a new shell to hide herself.
Sati, just like most children represents innocence. Just like a child does for their parents Sati "painted" a beautiful sun and a colorful sky for neo over the grim gray/green bland sky before it.