As Kotaku previously reported, Shin Megami Tensei IV Final is a totally new game. We get a very (I mean very) brief look at game play in this debut trailer.
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Slated for release in Japan next year, Shin Megami Tensei IV Final isn't a "definitive edition" of the previously released Shin Megami Tensei IV. It's an entirely new game set in the same world, featuring a completely different era and setting, all new characters, a branching storyline and multiple endings.