I also think that, based on his tweets, what most people are assuming are linear are something reminiscent or close to Uncharted. I think that is a HUGE misunderstanding. While yes, the endgame (what comes after the train section most likely) may be similar to that structure, I dont think the train section really is. I think it acts more as a base, and you progress through some semi open areas in order, as apposed to in the previous areas where you can pretty much do what you want. To be honest. I really don't see the point in the Airship if its just to fly over one continent. Something tells me that the continent the train section is on is full of stuff to do as well, its just more structured and in order storywise until you obtain the airship. What happens after is another story, but here I think we shouldn't really call it linear, just similar to previous FF games.