Persona 3 and 4 have both, so far, had final boss confrontations that EMBODIED the themes of the games.
In Persona 3, the final boss loomed at the very end, an invincible, inescapable monster that would kill everything and everyone. You could either attempt to face and confront that fact, or you could ignore it and live out your last days as though your life wasn't about to end. That choice is given entirely to the player.
Exactly like mortality and death. You can either except that you are going to die, and live as if each day is your last, or you can ignore your mortality and live as though your days will never end.
In Persona 4, the final boss waits behind three or four different false bosses. Each and every time, you can either fail entirely to catch the right clues that would lead you to the True Final Boss or deliberately brush aside confusing loose ends to settle for a convenient patsy.
The quest for Truth -- real truth, not just facts or comfortable ideas -- is a long, difficult process that often never truly ends. You can give up much too soon and end up missing everything, wandering in a fog of illusions.
I wonder how this third game will tie the player's choice into the themes of Slavery and Emancipation? It could be as simple as a single choice (as in P3) to except slavery in return for safety or power or whatever else... or (as in P4) it could be a gradual acceptance of one chain and manacle after another until you find yourself completely immobilized.
ALSO: Thank GOD that this will be on the PS3!
I don't want to shell out for a PS4, and I've barely gotten my money's worth out of this new PS3 in the first place.