I'm getting a very distinct feeling that the only explorable areas throughout the game is sector 7: for at least half, sector 5, and upper plate sector 8. They really haven't shown any other notable areas or at least new ones. Like, they've expanded certain dungeons (Train graveyard, shinra HQ, sewers, subway/ tunnels) But I think there has only been one semi new area that has been shown is where Roche shows up in the new trailer. It reminds me of the bases from XV. This might be a smaller title than anticipated. The only reason why I bring this up is because I remember at the start of the project, they mentioned that they were aiming for a fully explorable Midgar. I think thats how they might get us on DLC