If history is to be unwritten New Game+

[Neoyoshi]

It's certainly a novelty, and i believe the wider audience will love the experience.

But it is fun to speculate, and perhaps theorize on what they could do to have fun with New Game+

One example is what time-travel tends to do in most Time-travel stories- alternate realities/parallel universes:

Instead of your character just reliving the past stories events; a second -stronger; more seasoned version of yourself enters into that past, and passively experiences what had already transpired, and perhaps being able to participate in story events without disrupting the timeline.

Or perhaps being able to see events that happened off-screen that were never shown but were always implied or illustrated via story dialogue.

These things would of course never (probably) happen with the development of the NG+ system, but there are so many neat interesting things they could do if they made the choice to invest more heavily.