Considering the original game came out in 1997 with all the limitations of the first PlayStation, and Midgar was bigger than what we got to see, it doesn't come as a surprise we'll get to see more of it in a PS4 remake that wasn't shown the first time around. I doubt we'll get another FFXIII after everything they worked on since being much better than that. Not that it's hard to make something better than FFXIII, mind you.
Obviously, but since most of the things people went nuts over regarding Versus XIII/XV was when he was the director, I don't have a lot of reason to doubt him right now.