Oh wow I'm actually surprised by that since there always seems to be a part in every FF game where you explore an uninhabited city area so I thought that would be XV's.
I'm happy its not though since it will be much more interesting as a living area. I'm even more excited to see it now.
Also is Tenebrae the name of the city or the country?
Both? XD This location is called Tenebrae Valley.
By the way, there are still about 50% of regions and cities of the game world unrevealed claimed Tabata recently. The Gameinformer guys that visited the studio for a week too said they saw some more cool stuff that so far wasn't shown to the public yet.
They talked about this and lots of other things in a two hour long podcast:
I actually watched the whole thing yesterday night, lol, but I probably forgot most of the stuff so I can't really give you guys a good summary.