Final Fantasy XV's game director -- Tetsuya Nomura -- has said that the pre-rendered cutscenes that have been a series staple (for better or worse) will be lessened in favour of player-controlled, "dynamic" sequences.
“Since the beginning of 3D graphics, Final Fantasy has largely used pre-rendered movies, but what’s different about this new hardware is that it allows you to direct what has previously been pre-rendered and make it real-time. For this reason, even in considerably dynamic scenes, the player can still control their character,” Nomura said in a new video, translated by Gematsu.
“The scene we saw at E3 where a Leviathan is rioting through a town, and the main character comes in fighting and flying around in a current of water. Until now this scene would have been completely pre-rendered into a movie by Visual Works (Square Enix’s film producing team). But now you’ll actually be able to play through it in real-time.”
"Because this game is action-based," he added later on, "we’re doing our best to stay away from situations where the character doesn’t have control. Enemies and allies alike will move around, and fighting within the speedy progression of battle is what makes this Final Fantasy different from previous installments."