Square Enix added a new feature to the North American version of Dissidia: Final Fantasy. Arcade mode is designed for quick play. The computer automatically sets your stats, attacks, and lines up five enemies to fight.
I played the arcade mode and it does not set the last fight. Sephiroth won’t automatically appear as Cloud’s boss. When you beat arcade mode you’re rewarded with Chocobo Cologne which can be used to boost your story mode characters.
Dissidia: Final Fantasy uses the same voice actors for all previously voiced Final Fantasy characters. That means you’ll hear familiar voices from IV, VII, and X. Just to check, I asked about Japanese voice acting which expectedly isn’t in the North American version. The representative who answered my question was quite candid about her response and said she thought the original voices were better. You don’t get brutally honest responses like that everyday!