One thing to consider is that the game isn't as large as it always was; Nomura said - in a very round-about way - that his broader idea for the plot had been sliced into multiple chapters that could be told across multiple games. At least that's how I read it, and somebody in the know compared the situation to making one Harry Potter/The Hobbit to me. If they've done that, it does mean less areas to create and less to animate, inevitably, which means they can churn it out faster.
Interesting. It's certainly a way to try and reconcile the need to release something regularly, as well as the basic practical problems of trying to develop games that big in scope that a regular release of them would be improbable, as well as trying to be innovative after the largely failed results of the Lightning trilogy.
But.
I don't like the idea. I've joked about a FFXV "Prologus" game, perhaps akin to what Kojima has just done for MGS 5, because the company's financial reports like to talk about trying to monetise a game before it's out or something, but to chop the game up into episodes would really irk me. It works well enough for adventure games like what Telltale makes, and despite the artificiality of it, Broken Sword 5, but I'm not convinced that it will work well for an entire RPG. Well, it could, but I'm a bit prejudiced by my general displeasure at the idea. I miss the idea of self-contained mainline games.