Non-Mandatory Stealth Gameplay
From the looks of the trailer, being able to stealth your way through a dungeon will be an option. It would be excellent if instead of mandatory stealth sections during dungeons, the option to stealth is always available. To encourage players to use stealth, they could offer XP bonuses or even special weapons and costumes as rewards.
Either way, the key point to take away from this is that stealth gameplay should not be mandatory. Nothing kills the entertainment of stealth gameplay more than making it necessary to proceed, because the player then doesn’t feel like they did well for passing the section. It was necessary to proceed, so repeated failures just ends up being frustrating. Do yourself a favor, Atlus. Make it an option rather than a necessity.