When I said restrictive, I meant that, given how huge and supposedly alive (it's a metropolis) Lucis is, it's probably going to be intersected in such way it's feasible for consoles to run it. I'm thinking something much smaller (but with lots of detail) like Yakuza (the 2011 night streets gave that feeling, with they narrow streets full of neon and shops) rather than something as vast asGTA. So, you should explore the castle and its sorroundings and certain districts (I'd love it were an arcade to play different games, pubs...)
And of course, going by the plot, Lucis is under attack. But sure, FFs usually change their plot halfway the game, so I guess it's not always going to be under Niflheim's forces.
And yes, I seriously don't know how they're going to make them! For example, in Accordo: how much space we'll be able to explore? How many NPCs (and how dynamic) are there? Which ones can we interact to? How do we know we can interact with them? How many buildings can we enter to? I mean, look at this:
I'm very curious to see how they brach it to make it feasible on consoles AND for the programmers, since they're humans and they seek for a game that is reasonable and fun, not a titan just for the sake of it.
So, this would basically (I think) be something à la XII, where you know Rabanastre is huge but you can't obviously explore it fully. Given how realistic and seamless they seem to be making this, one wonders which route they'll take to make it like that.
I've been waiting for cities' gameplay (not battle) since 2006 ;_; Especially since last year, with Accordo's reveal. It reminds me of the awe-inspiring Lindblum, best FF city ever (followed by Treno, Alexandria, Deling, Dollet...
)