You're completely right. It's super duper suspicious that they wouldn't at least show us something. Even when they're taking a long time on a game, they give us footage. Going from a long animated sequence one year to literally nothing at the biggest game show of the year and only a 13 second clip at the end of the year... It's weird. Makes me think that there is indeed something afoot.
I really hope it's not just because they're putting it on the NX too, because that would be the obvious answer. On the other hand though, the idea that they're drastically altering some aspect of the game and setting themselves back at least a year is much more disturbing. They can't afford to be so bad with their development.